I'm planning on installing a 12 port double gang faceplate with about 10 cat5 shielded jacks. the customer wants the ability to put a cover with a lock on top of the faceplate. I am thinking of a small metal lockbox (that they use for security systems)

can any point me in the right direction for such a metal box, it only needs to be a little larger than a double gang faceplate with a lock.

i plan on mounting it over the faceplate, cutting out the back and putting a hole in the bottom for the patch cords to route.