Seems like an awful long time to go without pooping. I would maybe suggest that he might be *ehem* eating it. Gross, I know.. but if he's out there for a while with nothing to do.. sometimes they get bored, or their still hungry. Bunny does this on very rare occasion.. Used to do it when we weren't feeding her as much as we do now. Otherwise, I have no idea. Seems like way too long to go without pooping.