One-time-lock requirements govern transport of warehoused goods, with customs officers and licensees assigned distinct sealing responsibilities.

Transport of goods between an import customs station and a warehouse, between warehouses, or from a warehouse to an export customs station requires a securely sealed one-time-lock on the vehicle's load compartment, unless permitted otherwise based on the nature of goods or manner of transport. The proper customs officer affixes the lock for import-station-to-warehouse movement, while the licensee affixes it for inter-warehouse transfers and export movement.

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