Export documentation requirement: presentation of prescribed shipping bill or declaration enables duty-free export of warehoused goods. Amendment provides that warehoused goods may be exported without payment of import duty only where a shipping bill or bill of export in the prescribed form, or a label or declaration accompanying the goods as referred to in section 82, has been presented in respect of such goods, substituting clause (a) of sub section (1) of section 69 to make presentation of specified export documentation the operative condition for duty exemption.