Customs sale of uncleared imported goods after thirty days regulates disposal, notice, and special treatment for hazardous goods. Imported goods not cleared for home consumption, warehoused, or transhipped within thirty days of unloading, or within further time allowed, may be sold by the custodian after notice to the importer and with the proper officer's permission. The same applies where title to the goods is relinquished. Animals, perishable goods, hazardous goods, and arms and ammunition are subject to special sale rules, and 'arms' and 'ammunition' take their meanings from the Arms Act, 1959.