Container Seal Control and Discrepancy Checklist

Control a container seal through an operational evidence trail, not just a number on a document. Record who applied it, where and when; carry the number through the loading and transport records; verify it whenever the sealed doors are legitimately observable; and record who removed it during an authorised opening.

If the seal is missing, broken, damaged or different from the transport record, pause routine opening. Preserve what can be observed without changing the scene, record the container and seal identifiers, and contact the responsible carrier or forwarder and your customs broker. Follow any terminal, Australian Border Force, biosecurity, police or site direction that applies. A discrepancy is a reason to preserve and escalate evidence; it is not proof of theft, tampering or liability.

The short answer: treat the seal as an evidence control

The joint IMO/ILO/UNECE Code of Practice for Packing of Cargo Transport Units is non-mandatory guidance. Its receiving guidance says that, where a seal number appears on the transport documents, the number should be checked; if it differs, is damaged or is missing, that could indicate the unit was opened and the CTU operator should be contacted.

The careful words are could indicate. A broken or mismatched seal does not establish when, why or by whom it occurred. Your first job is to keep observations neutral and preserve a reliable timeline. In the importer's workflow, the carrier or forwarder may be the practical service contact, but that is an OPL escalation step, not the CTU Code's wording and not a liability conclusion.

This control does not replace the container-loading check. Loading evidence can establish the container, doors and seal at origin. This article carries that evidence forward through transport and receiving.

Build the seal record before movement

Ask the supplier, consolidator or nominated packing party to record the seal immediately after the loaded doors are closed, where that party is responsible for sealing. The record should tie together:

• booking and shipment reference;
• container number and size/type;
• seal number exactly as marked;
• seal type if known, without making a security certification claim;
• date, time and location of application;
• name or role of the person applying it; and
• photographs that show the container number, closed-door condition and readable seal marking.

The sea-container cleanliness evidence guide deals with cleanliness and contamination observations. Keep that evidence linked but distinct: a clean-container record does not prove the seal's application-to-receipt sequence, and a seal record does not prove cleanliness.

Maersk's current guidance describes a numbered seal and tells buyers using its service to compare the destination seal number with the bill of lading. It also places the seal number into the supplier's shipping-instruction workflow. Treat that as one carrier's process; confirm the records required for your booking.

Verify at each observable handoff

Do not promise an observation at a point where the importer has no access. Instead, define the handoffs at which the seal and doors are legitimately observable and identify the party responsible for the record.

This is an OPL operational evidence framework. Custody here means the recorded sequence of observable handoffs; it does not determine legal possession, responsibility or liability. The framework does not imply the importer can inspect a container inside a controlled terminal, direct another party's operations, or disregard site safety rules.

Use a discrepancy response that preserves evidence

If an exception is found before routine opening, use a calm, bounded response:

1. Stop the planned opening if it is safe and lawful to do so.
2. Keep people clear of any safety or security risk and follow site procedures.
3. Do not cut, replace, reposition or “fix” the seal merely to match a record.
4. Photograph the container number, both doors, locking bars, seal as found and the surrounding condition from permitted positions.
5. Record time, location, observer, booking reference, document seal number and observed seal number or absence.
6. Contact the responsible carrier or forwarder and the customs broker; notify any authority or site contact required by an existing direction.
7. Record the instruction received and the identity or role of the person giving it.

If goods are later found damaged or short, use the appropriate claims process. Do not let a later claim objective rewrite the first neutral observation.

Keep security observations neutral

ABF security material lists suspicious container indicators and a seven-point inspection as awareness measures. Such indicators can justify caution and reporting, but they do not prove a particular event occurred.

Avoid loaded labels such as tampered, stolen, breached by the carrier or supplier fraud unless a competent authority or evidence process establishes them. Prefer observable language: left locking bar bent outward, seal body separated, or number differs from the bill by one digit.

If there is an immediate safety or security concern, follow emergency and site procedures. This operational checklist does not tell a reader to handle a suspicious object, enter an unsafe area or conduct a forensic inspection.

Respect authority and biosecurity directions

Some Australian biosecurity pathways can impose specific seal controls. A DAFF notice dated 21 May 2021 states that containers selected for its Cargo Compliance Verification process are subject to an Inspect (Secure Seals Intact) direction and that remaining containers in a multi-container consignment must stay secured with seals intact pending the inspection outcome.

Those examples do not create a universal rule for every container. The shipment's actual directions control. If ABF, DAFF, a terminal or another authorised party has directed that the unit remain sealed, do not open it merely because the ordinary warehouse appointment has started.

Ask the broker or responsible service provider to confirm whether any hold, inspection direction or supervised-opening condition applies. Keep the direction with the seal record.

Resume only after the next action is documented

Do not resume the routine warehouse plan until applicable site or authority conditions have been confirmed and the party responsible for the container's movement or opening has documented the next action. That record does not decide legal authority or liability. Record:

• who authorised the next action and in what capacity;
• the date, time and communication channel;
• whether opening is unsupervised, witnessed or conducted elsewhere;
• who removes any seal and what happens to it; and
• the condition record made immediately after authorised opening.

Once access is authorised, the incoming quality inspection guide can structure the goods examination. Keep the pre-opening seal evidence separate so the chronology remains clear.

Preserve the final evidence pack

The final package should contain the origin seal record, transport documents, handoff records supplied to you, destination photographs, discrepancy log, escalation messages, directions received, authorised-opening record and any downstream condition report.

Index the package by container and shipment reference. Do not overwrite the origin photo with a destination filename or replace an incorrect document with a corrected one. A reliable file shows the sequence, including errors and corrections.

That evidence may later assist a carrier, broker, insurer, authority or adviser. This article does not decide which party is responsible or what remedy is available.

Sources

• UNECE — CTU Code overview
• UNECE — CTU Code receiving precautions
• Maersk — Container seal numbers and use
• Australian Border Force — Goods Compliance Update, Autumn 2022
• Department of Agriculture, Fisheries and Forestry — Containerised Cargo Verification notice