Fuente: WIPO "tomato" The invention comprises a paper box for fruits and vegetables comprising a fixing system for fixing a lid and/or cover, or a part thereof, to a package in general, said fixing system comprising at least one pin element (10) and at least one access slot (20) within which, in use, said at least one pin element (10) is engaged. The pin element (10) is configured so that, following penetration into the slot (20), it has at least one portion thereof that is contrasted against a portion of the wall delimiting the slot.