Can a bunny be re-litter trained?

When I first got my rabbit he had a cage with a litter pan in the corner and he learned to use it just fine. I recently got a new, bigger cage and set it up just how his other cage was. He never uses his litter pan. He always pushes it the side and goes right beside it. When I move it to that corner he pushes it away and uses the other corner. I've even tried setting it up going across the entire side of that cage and he just goes right in front of it. BUT sometimes we go to my aunt's on the weekends and he uses his litter box just fine there and its in the same location and same set up. Are there any suggestions to get him to start using it again?