A receptacle for packaging an order of photographs and negatives includes a base panel and a cover panel which define two pockets each of which has an openable and closable side. The base panel has a flap which extends beyond the openable and closable sides while the cover panel terminates at, and has an auxiliary tab adjacent to, the openable and closable sides. The flap is provided with a restraining tab which normally overlaps the auxiliary tab. The pockets have an open position in which the restraining tab is located between the auxiliary tab and the base panel, and a closed position in which the auxiliary tab is located between the restraining tab and the base panel. A device for closing the receptacle includes a slot designed to receive the region of the junction between the flap and the restraining tab, and a surface arranged to be contacted by the pockets. The slot and the surface have a relative orientation such that the flap is bent when the junction is received in the slot and the pockets contact the surface.