13. Where under the provisions of any law for the regulation of duties of customs, any dock, mooring, pier or shed, provided under this Ordinance for the use of sea-going vessels is appointed to be a dock or wharf for the landing or shipping, or a warehouse for the storing of goods within the meaning of such law, the Authority shall set apart, maintain and secure on or in such dock, mooring, pier or shed such option thereof, or place therein, or adjoining thereto, for the use of the officers of Customs as the Government may approve of or appoint in that behalf.