If you were to black out the hides, maybe some non toxic glue? (Ive heard of people using hot glue in their enclosures) Honestly tho, I think it would be easier to find empty boxes laying around that would work better.. Sometimes Ill check the pantry for stuff.. Or you could swing by the store, buy a couple boxes of pasta.. cook them (or put them in a ziplock bag) and use them.. or you can snatch a box from work.. I took a couple that had pens in them and just put a rubber band on the pens.. Honestly any smaller box will do.