On a container ship, how do you know if a container placed onboard is not declared wrong and what IMO regulations apply?

flowchart LR
    A[Container arrives] --> B{Packing certificate\n& transport doc?}
    B -->|No| C[Do NOT load]
    B -->|Yes| D[Check labels/markings\nvs declaration]
    D --> E{Match?}
    E -->|No| C
    E -->|Yes| F[Check segregation\nvs spotting plan]
    F --> G{Compliant?}
    G -->|No| C
    G -->|Yes| H[Load & record]

• Verification method: Document check of container/vehicle packing certificate (IMDG 5.4.2.1)
• Certificate requirements: Clean/dry container, no improper segregation, sound packages, proper marking/labelling/placarding, transport document received
• Physical check: UN number, proper shipping name, hazard class labels, orientation arrows, no damage/leakage
• Segregation: Cross-check with dangerous-goods spotting plan and fire plan (IMDG 7.3.3.5)
• Suspicion protocol: Reject if non-compliant with IMDG sections 12 or 17 or missing certificate (A.714(17) ch-2 §2.9.1)
• Mandatory instrument: IMDG Code (IMO resolution A.716(17) as amended)
• SOLAS requirement: SOLAS Chapter VII Regulation 3
• Guidance: MSC.1/Circ.1442 for packing certificate verification