I remember looking for one of those boxes a few years ago but they weren't available, so I came up with a different solution. I bought 2 of the rack mounts from Apogee, then I bought a rack mount case from Guitar center for about $40. There is now ventilation for the Apogee from both above and below, and I've got both the AD1000 and the power supply securely mounted. It is a little bulky, but works great. I've got a spare rack mount available if anyone wants to get one.
Cheers
Candace