Abstract: A protective box for providing a secure covering for a closure device, such as a lock, bolt, or the like. The protective box includes a housing having a rear wall which has an opening therein for access to the closure device to be protected. The rear wall is securely fastened onto the support surface containing the closure device, such as onto a door or wall supporting a lock. A cover member closes the front of the housing and is slidable between a closed position providing an enclosed area within the housing into which the closure device can face, and an open position whereby access can be had to the closure device. A lock mounted on the cover member engages with a roller assembly provided in the housing to securely retain the cover member in its closed position. In a modified form, two locks can be mounted on the cover member for engagement with associated latching elements disposed on the housing.