A security lock box that is mountable to a shelf. The shelf has a shelf surface for supporting merchandise thereon. The security lock box includes a cover adapted to be supported on top of the shelf and adapted to house and secure merchandise supported on the shelf therein. The cover is at least partially transparent to display merchandise when housed therein. The security lock box further includes a security device, which has a shelf mount and a lock. The shelf mount is adapted to be fastened to the shelf, and the lock releasably locks the cover to the shelf mount between a locked state, wherein the cover is locked to the shelf mount, and an unlocked state, wherein the cover is releasable from the shelf mount.