It really is amazing how they decide where to go. I had the same two hides in Pi's enclosure since I basically got him. He stopped using the hot side one so I switched them to see if it was a thermo issue or a security issue. Sure enough he went in the one he previously liked but now on the other side. So I went out and bought two identical new hides. So I had 4 hides in there and he would only go in the new ones. Now the security issue has been solved but they are pretty small so he kinda wears them. He's like a turtle with a shell. Lol. I have to move them back into place constantly. So next will be bigger ones like the OP and I'd wager he will still want the small ones.