A locking cover includes a plate having a front surface with a solid raised panel, and a lock retaining housing. A side wall surrounds the perimeter of the plate. A first aperture runs through the front surface. A cavity is adjacent the first aperture, and the cavity includes a second aperture. A set of pin insertion channels run through the side wall and the cavity, terminating at one end in a wall within the plate. A blocking pin is adapted to be inserted in the set of pin insertion channels and be locked into place over the second aperture. A tubular cylinder lock is adapted to be inserted in the first aperture and into the lock retaining housing. A first fastener is adapted to be inserted through the second aperture to engage a second mating fastener.