What this is
What is a container and trailer seal check?
What is a container and trailer seal check?
It is a checklist completed by the receiver on every sealed inbound arrival, built against the FSMA Intentional Adulteration rule. It verifies the seal number on the paperwork against the number on the vehicle or container, and records the seal's physical condition before the doors are opened.
When is a container and trailer seal check completed?
It's completed at the point in the process it protects — on arrival, before the doors open — every time a sealed load arrives. A check performed after unloading has already started has missed the point it exists to cover.
What makes a seal number 'match exactly'?
Every character stamped on the physical seal must correspond to the sequence on the delivery note, with none substituted, transposed or assumed from a partial read. A close match on a worn or partly legible seal is not the same as an exact one, and this template treats them as different answers.
Scope
When is a container and trailer seal check required?
This checklist is one step in a larger programme. Using it for work that belongs to a neighbouring template produces records that are hard to report on.
Use this template when
- A sealed container or trailer has arrived, or is about to, and the seal needs verifying before the doors open
- The workspace is being set up, or the register needs an entry added or retired
- You are running the Inbound and Receiving programme and this is one of its steps
- A linked record needs this one to exist: feeds Security Incident and Receiving Inspection
- A seal number cannot be matched exactly to the paperwork, however minor the discrepancy looks
Do not use it for
- Delivery Appointment Record, which books an inbound delivery into a dock slot and records whether it arrived when it said it would.
- Receiving Inspection Record, which checks an inbound delivery against the purchase order and the specification once the doors are already open.
- Over Short and Damaged Report, which records a discrepancy between what was ordered, what the paperwork says and what physically arrived.
- Container Devanning Record, which records how a container was unloaded once it has already been let through the seal check.
- Anything outside KnowLogistics, which belongs in the workspace that owns that process
Compliance mapping
Which FSMA Intentional Adulteration rule requirements does this satisfy?
This checklist satisfies a specific regulatory obligation, not a general good-practice habit. Each section maps to a requirement under the FSMA Intentional Adulteration rule.
| Clause | Requirement | Where it lands |
|---|---|---|
| 21 CFR 121.126 — Food defense plan | a written food defense plan naming each actionable process step and its mitigation strategy | Header |
| 21 CFR 121.130 — Vulnerability assessment | the seal is the mitigation strategy assigned to the receiving actionable process step | Header |
| 21 CFR Part 121 Subpart C — mitigation strategy monitoring | the mitigation strategy is monitored at the frequency the food defense plan specifies, by someone able to perform it correctly | Verification |
| 21 CFR Part 121 Subpart C — verification of mitigation strategies | verification that monitoring is happening and effective, hence the independent second check on the seal | Verification |
| 21 CFR Part 121 Subpart C — corrective actions | a documented corrective action whenever the mitigation strategy fails, i.e. whenever the seal does not check out | If it does not match |
| 21 CFR 121.4 — Qualified individual / training | the checker, and anyone escalating a mismatch, has food defense awareness training appropriate to their role | Header |
| 21 CFR Part 121 Subpart E — records | records of monitoring, corrective actions and verification created at the time and retained | Outcome |
What it does not cover
- Seal Present, which confirms a seal exists at all — a trailer that arrives unsealed with no exception raised has already failed before any numbers are compared.
- Numbers Match Exactly, which is a character-by-character comparison against the delivery note, not a glance that a seal is there and looks intact.
- Second Person Verified, which is the independent check that turns a lone receiver's assumption into a verified control, not an optional second signature.
- Doors Kept Closed Pending Instruction, which stops the load being opened and the evidence being lost before a manager has decided what happens next.
- Security Incident Raised, which is the record that a mismatch was treated as a security and food defense event rather than closed out as a paperwork correction.
Global
Container and Trailer Seal Check requirements by country
Seal integrity sits at the intersection of a mandatory US food safety rule and voluntary trade-security frameworks, and which one governs a site changes what 'compliant' means.
FSMA Intentional Adulteration rule (21 CFR Part 121)
a mandatory food defense control for registered facilities where receiving is a named actionable process step
the seal check must be monitored, verified and corrected exactly as the facility's food defense plan states, independent of whether anything was actually tampered with.
C-TPAT Minimum Security Criteria
a voluntary supply-chain security programme naming container/trailer seal verification, via view-verify-twist-tug, as a baseline requirement for certified importers
losing C-TPAT status over a poorly evidenced seal check costs a company its trusted-trader benefits at the border — a commercial consequence separate from any food safety finding.
ISO 17712 (mechanical seals for freight containers)
sets the classification — high-security, security or indicative — the physical seal must meet, and the numbering convention the paperwork is compared against
a check against a seal never rated to the class the shipment required is verifying the wrong thing correctly, however carefully the numbers are compared.
How to complete it
How to complete a container and trailer seal check, step by step
Ticking every box on this checklist isn't the same as the seal check holding up under scrutiny. Four judgement calls decide whether the record proves what it claims to.
A seal number worn, greased or partly obscured isn't automatically a match or a mismatch — it's a decision. Treating an unreadable digit as a pass because the rest looks close is how a genuine substitution gets waved through under the field meant to catch it.
Second Person Verified scores 'Not required' the same as 'Yes'. That's only defensible if the workspace has defined which lanes, carriers or load types need the second check — otherwise 'not required' is just the answer a rushed receiver reaches for.
A photograph taken after the fact, of a seal already cut or a load already moved, satisfies the field without preserving what it exists to preserve. It's only evidence if taken before anything about the seal's state has changed.
Discrepancy Found and Security Incident Raised are separate questions, and the record doesn't force a Yes on the first to produce a Yes on the second. Deciding that threshold at the moment of receiving, rather than by a policy set beforehand, is how genuine tampering gets recorded as a clerical note.
What auditors find
Most common container and trailer seal check findings
Across sites running this checklist, the same gaps keep showing up between what the form asks and what actually gets verified.
| Finding | Clause | What fixes it |
|---|---|---|
| Seal numbers are compared by eye against a delivery note in a different format (leading zeros, dashes) than what's stamped on the seal, so mismatches are missed rather than recorded. | 21 CFR 121.130 — Vulnerability assessment | Standardise the seal number format the paperwork must state, and reject any delivery note where the two formats can't be compared directly. |
| 'Second Person Verified' defaults to 'Not required' as the fast path, so the field stops meaning anything on sites that never define when a second person is needed. | 21 CFR Part 121 Subpart C — verification of mitigation strategies | Set the rule for when a second check is mandatory — a high-risk lane, a first-time carrier — at workspace level, not left to the receiver on the day. |
| Photograph Taken is answered 'N/A' by default when a phone has no signal or charge, removing the only durable evidence a seal was checked at all. | 21 CFR Part 121 Subpart E — records | Make the photograph mandatory unless a supervisor overrides it, and log the override separately from a genuine N/A. |
| A mismatch is logged and a Case ID raised, but 'Security Incident Raised' is left No because the receiver assumes quality, not security, owns it. | 21 CFR 121.126 — Food defense plan | Route every 'Discrepancy Found: Yes' answer to a mandatory Security Incident Raised prompt rather than leaving it a free judgement call. |
| 'Doors Kept Closed Pending Instruction' is answered after the doors have already been opened to check the load, defeating the control it's meant to record. | 21 CFR Part 121 Subpart C — mitigation strategy monitoring | Sequence the form so doors-closed is answered and locked before contents verification unlocks. |
| Training records for the receiver completing the check aren't linked from this template, so a food defense audit can't show the checker was qualified. | 21 CFR 121.4 — Qualified individual / training | Link the Checked By and Receiver fields to a training register so competency evidence travels with the record. |
Case in point
Case in point: the seal that was intact and still wrong
A receiver at a cross-dock site checked a bolt seal, saw it undamaged, ticked Seal Intact And Undamaged as Yes, and moved straight to unloading. The seal number on the trailer read 0041862; the delivery note read 0041682 — two digits transposed. Nobody had compared the two strings character by character, because 'the seal looked fine' had quietly become the actual test being applied.
The transposition surfaced three weeks later during a food defense drill, when an auditor pulled the paperwork and matched it against the photograph on file. The seal had never been tampered with — the numbers had simply been mistyped at origin. But the check meant specifically to catch a substituted or altered seal had passed a load it was never actually applied to, and the only reason the gap surfaced was the audit, not the process.
The template
The template, field by field
The form exactly as it installs. Every field, option, score and conditional rule is editable, and the links to other templates come with it.
4 sections
- Reference
- LOG-004
- Archetype
- Checklist
- Record ID
- SEAL-2026-000
- Scoring
- Seals intact and matching
- Direction
- High is good
- Singleton
- Yes
- Basis
- FSMA Intentional Adulteration rule
- Links
- Feeds Security Incident and Receiving Inspection
- Tags
- Inbound, Security, Seal
- Sections
- 4
- Fields
- 39
- Follow up fields
- 4
- Repeating sections
- 0
- Links out
- 3
Header
13 fieldsCheck ID*
Auto sequence. Format SEAL-2026-000.
The record's own ID. Other templates point at this value.
Status*
Drives who this goes to next.
- Planned2 pts
- In progress2 pts
- Complete3 pts
- Deferred0 pts
- Open0 pts
- Closed3 pts
- Overdue0 pts
Date and Time*
Completed By*
Site*
Site ID*
Format SITE-000.
Links to FDN-001 Site ID
Vehicle Or Container Number*
Seal Number On Paperwork*
Seal Number On Equipment*
Seal Type
Delivery Note Reference
Checked By*
A Mismatched Seal Is An Event
The seal number is the only evidence the load was not opened between despatch and here. A number that does not match the paperwork is a food defense and security event, not a note for the file.
Verification
6 fieldsSeal Present*
- Yes2 pts
- No0 pts
- N/Aexcluded from denominator
Numbers Match Exactly*
- Yes2 pts
- No0 pts
- N/Aexcluded from denominator
Seal Intact And Undamaged*
- Yes2 pts
- No0 pts
- N/Aexcluded from denominator
Seal Applied To The Correct Point*
- Yes2 pts
- No0 pts
- N/Aexcluded from denominator
Second Person Verified*
- Yes3 pts
- Not required3 pts
- No0 pts
Photograph Taken*
- Yes2 pts
- No0 pts
- N/Aexcluded from denominator
If it does not match
6 fieldsDoors Kept Closed Pending Instruction*
- Yes2 pts
- No0 pts
- N/Aexcluded from denominator
Manager Informed Immediately*
- Yes2 pts
- No0 pts
- N/Aexcluded from denominator
Carrier Contacted*
- Yes2 pts
- No0 pts
- N/Aexcluded from denominator
Load Segregated On Unloading*
- Yes2 pts
- No0 pts
- N/Aexcluded from denominator
Contents Verified Against Manifest*
- Yes2 pts
- No0 pts
- N/Aexcluded from denominator
Security Incident Raised*
- Yes2 pts
- No0 pts
- N/Aexcluded from denominator
Outcome
14 fieldsSeal Verified*
- Yes2 pts
- No0 pts
- N/Aexcluded from denominator
Discrepancy Found*
- No3 pts
- Yes0 pts
Case ID
Thread key
Product Integrity Affected*
- No3 pts
- Possibly1 pt
- Yes0 pts
Hold ID
Links to QUA-003 Hold ID
New Seal Applied
Action Required*
Raise the action record, then enter its reference here.
- No2 pts
- Yes0 pts
Priority
- High0 pts
- Medium1 pt
- Low3 pts
CAPA ID
Format CAPA-2026-00000.
Links to FDN-014 CAPA ID
Action Owner
Receiver*
Signature*
Security*
Second Signature*
LOG-004 · record IDs look like SEAL-2026-000 · Feeds Security Incident and Receiving Inspection
Open in KnowellaRun it with agents
From a document you fill in to a programme that runs itself
The form is the easy part. Deciding when a mismatch is a security incident, keeping the photograph attached as evidence, and proving the receiver was trained is what actually slips.
Holds the seal check register against every sealed arrival, links each check to its Receiving Inspection Record, and keeps the paperwork-versus-seal comparison auditable.
Owns the Security Incident record a mismatch routes into, and keeps the escalation from doors-closed to manager-informed to incident-raised moving without a gap.
Maps this check against the FSMA Intentional Adulteration rule's vulnerability assessment and mitigation strategy requirements, and surfaces where a site's records won't stand up to an audit.
Coordinates the crew, rolls completion and exceptions into one view, and holds every write for your approval before it touches a record.
This template lives in KnowLogistics — supply chain execution. Inbound, outbound, inventory, yard, claims, supplier lifecycle and customs.
Glossary
Container and Trailer Seal Check definitions and key terms
- Actionable process step
- A point in the supply chain that an Intentional Adulteration vulnerability assessment identifies as significantly vulnerable, where a mitigation strategy is legally required. Receiving is commonly designated as one.
- Mitigation strategy
- A control put in place at an actionable process step to significantly minimise or prevent an intentional adulteration vulnerability. The seal, plus the check that verifies it, together form the strategy for an inbound load.
- High-security seal (ISO 17712)
- A seal classification under ISO 17712 rated to resist a defined set of tools and forced-entry attempts for a minimum time, distinct from the lower 'security' and 'indicative' classes.
- Chain of custody
- The unbroken record of who held, moved or had access to a load between despatch and receipt. An intact, matching seal is the primary evidence custody was not broken in transit.
- C-TPAT minimum security criteria
- Baseline controls a US Customs-Trade Partnership Against Terrorism member must maintain, naming container and trailer seal verification, via view-verify-twist-tug, as a specific requirement.
FAQ
Frequently asked questions about container and trailer seal check
What is a container and trailer seal check?+
A checklist completed by the receiver on every sealed inbound arrival, verifying the seal number stamped on the trailer or container matches the paperwork, and recording its physical condition before the doors are opened. It sits inside KnowLogistics' Inbound and Receiving programme.
Why does a seal check matter if the seal is intact?+
An intact seal only proves the doors haven't been opened if its number also matches what despatch recorded. A seal that's undamaged but carries the wrong number, or is applied to the wrong point, has still failed the check the paperwork is supposed to guarantee.
Who has to do the seal check, and how many people?+
The receiver does the primary check on every sealed arrival. A second, independent person verifies it where the workspace's rules call for one — this template treats 'not required' as a valid, scored answer, but that threshold has to be defined somewhere, not left to the day's receiver.
What happens if the seal numbers don't match?+
The doors stay closed pending instruction, a manager is informed immediately, and the carrier is contacted. Once opened under instruction, contents are checked against the manifest and a Case ID, and where warranted a Security Incident, are raised.
Is a mismatched seal always a security incident?+
Not automatically — Security Incident Raised is a separate Yes/No judgement from Discrepancy Found. In practice, any transposition or substitution not immediately explained by a paperwork error at origin should default to raising the incident rather than closing it as a discrepancy.
How does this template connect to the rest of the programme?+
It feeds Security Incident and Receiving Inspection. A clean seal check clears the load into the Receiving Inspection Record; a failed one routes into the security process first.
Keep going
Related templates and programmes
Industries this is written for
Programmes this belongs to
Used together in Inbound and Receiving
Vendor and Contractor Register
Holds every supplier, contractor and service provider you work with, including their status and approval level
Delivery Appointment Record
Books an inbound delivery into a dock slot and records whether it arrived when it said it would
Receiving Inspection Record
Checks an inbound delivery against the purchase order and the specification before it is accepted into stock
Over Short and Damaged Report
Records a discrepancy between what was ordered, what the paperwork says and what physically arrived
Container Devanning Record
Records the unloading of a shipping container, covering condition, contamination, count and the conditions inside
Inbound Quality Gate
Holds a receipt until the checks that must happen before it enters usable stock are complete
More in Inbound
Delivery Appointment Record
Books an inbound delivery into a dock slot and records whether it arrived when it said it would
Receiving Inspection Record
Checks an inbound delivery against the purchase order and the specification before it is accepted into stock
Over Short and Damaged Report
Records a discrepancy between what was ordered, what the paperwork says and what physically arrived
Container Devanning Record
Records the unloading of a shipping container, covering condition, contamination, count and the conditions inside
Inbound Quality Gate
Holds a receipt until the checks that must happen before it enters usable stock are complete
Written and reviewed by
Siddarth Singh
Founder & Chief Executive Officer, Knowella
Certified Safety Professional and industrial and systems engineer with more than a decade inside food supply chain, freight and manufacturing operations. This page was written against the current text of the standards it cites, not against secondary summaries of them.
- Certified Safety Professional (CSP), Board of Certified Safety Professionals
- MBA, University of Chicago Booth School of Business
- MS and BS, The Ohio State University, Industrial and Systems Engineering
- Six Sigma Black Belt
Sources and last review. Reviewed 16 August 2026 against:
- FSMA Intentional Adulteration rule (21 CFR Part 121)
- ISO 17712 — Mechanical seals for freight containers
- C-TPAT Minimum Security Criteria — Importers
This page is general guidance, not legal advice. Confirm requirements with your jurisdiction’s regulator.