This anti-shoplifting box has the characteristic of a particularly compact locking device openable by magnetic action combined with manual mechanical action, said device including, on an object-containing drawer, a tongue which is internal and transversely holed for engagement by a cylindrical end stem, having a spherical head with a circumferential undercut, of a ferromagnetic body which is also cylindrical but of greater diameter such as to provide an annular stop ledge for the action of a compressed spring contained within an axial hole therein and reacting against an edge of the box.