If you are looking for a rear bumper style aluminum box, Wicked Mikey has a brand new one he is selling (just spoke to him this morning). He fabs lots of stuff and boxes are just one example of what he does.
This box is 32 x 26 x 14, will be all powder coated black, same locking latch, it is ready to go to powder coat, so delivery in about a week. It comes with one shelf already installed. His fabrication is super high quality, definitely no disappointments. It is currently without a top rail, but that can be added if desired. This also allows door orientation to be selected before railings are added and powder coat is applied. This is slightly taller and wider than the Aluminess Deluxe Box but not quite as deep. The price he is asking is a bit less than a Deluxe with rails and shelf. Pick up is North Hollywood CA. PM me if you have interest. $775 without rails, $825 with rails. No tax, available within a week or so. (If you want it without powder coating, subtract $120 for the bare metal.)
Here is a picture of a finished box he made. The one for sale is similar.