My hedgie, Hurley, is about 3 years old. At about 1 1/2, I introduced him to empty cardboard boxes and he LOVES to poop in them. For the most part, that is where he poops. He also likes to poop on his wheel, but what hedgie doesn't? Now that he associates cardboard boxes with pooping, he poops in his dig box. This would be fine, but he ruins it as soon as he gets in it and I can't use it as a toy for more than one digging session. Any suggestions on how to work around this issue?