After a bit of internet research I have decided that Geronimo lost his litter box way due to a bit too much unsupervised freedom. We're going to go back and start over, which seems to be the obvious answer. I "tried" before, but he was too obnoxious when he slammed his teeth over the bars and yanked on his cage until I gave up and let him out in the middle of the night. Well not tonight Mr Bunny! Your cage is going in the living room for the night, and will be moved back to my room in the morning. Then we will have limited, supervised romp time, only in my room, later in the day. Baby steps...*sigh*. Animals I tell ya!