I'm not sure about the socket trays. I bought them at the Swap Meet at the GM Nationals in Carlisle PA a couple years ago. I had to cut the 1/2" and 3/8" trays down to fit them in my 15" deep drawers. Notice that the rest of the 1/2" metric (blue) tray is in front of my cut down 3/8" tray. On the SAE (red) side, I was just able to cut the tray off because I don't have sizes that big.
Ha Ha Ha That's awesome! A couple of months ago this box was special order only. I see they are now stocked. I'm sure they are quite popular. Congrats! 

I have the same box as your snap on one but with a different name plate.. I suspect its an earlier on than yours. Is mine also supposed to have that trim though on the drawer 'handles'?