Filing of stores list required on arrival; retention rules allow consumables on board while foreign going, otherwise customs seal. All vessels and aircraft arriving at ports or airports must furnish a list or nil return of ship stores intended for landing, excluding consumable stores from Duty Free Shops. Retention of imported stores on board is governed by the Import Store Retention Regulations: consumable stores may remain on board duty free while the vessel or aircraft remains foreign going, otherwise stores must be kept under customs seal; only stores for immediate use may remain unsealed while excessive items like liquor and tobacco must be sealed.