No structure, building, or enclosure belonging to, or leased, maintained, or operated by the Board of Commissioners of the Port of New Orleans or others in the foreign trade zone in the Port of New Orleans shall be used for the storing of domestic merchandise or commodities, unless these domestic merchandise or commodities are to be mixed or commingled with merchandise or commodities which are either imported into this country or exported to a foreign country.
However, nothing in this Section shall prohibit domestic merchandise or commodities from being admitted to such foreign trade zone for the purpose of being repacked, sorted, graded, cleaned, scoured, or otherwise processed.