I have no idea where they came from, but we bought a company that had these 4 foot tall enclosed racks on wheels in all of their field offices. they locked front and rear, and were big enough for a mouse, keyboard and monitor to sit on top. with a KVM inside the door. If you have the space, I loved these things. They were durable, enough to live in retail store back rooms, and easy to work on. Similar to this.

