One-time-lock requirement: affix serially numbered bottle seal and record it on bill of entry and transport document. The regulations require affixation of a serially numbered one-time-lock (bottle seal) by the proper officer at the customs station when goods are removed for deposit into a warehouse; the OTL number and date/time must be endorsed on the bill of entry and transport document, and customs stations must record OTL number, bill of entry, truck/container number, date/time and the affixing officer's name, designation and telephone number, while warehouse keepers inspect seals and permit unloading only if seals are intact.