Man I must have got lost in this topic.
i feed Ozzy and Osiris in the same cardboard box that I have been feeding Ozzy in for the last year. I just put fresh paper down everytime.
Never saw a need in cleaning it cause there is never a mess in it not even on the paper towels.
Still smells just like a cardboard box
Guess my bp's are neat eaters. They hit it and wrap then swallow. There is never even any blood.