Well your correct on the fact that being near the front i can pull the tub almost fully out, but i cant totally remove the tub. I decided this is fine with me though as I just move the mice to another tub and suck all the used substrate out with my shopvac. Then just give it a good cleaning with some clorohexidine, let dry, and then refill.
I dont have the packaging anymore but I think you are correct in your guess.![]()