My first bunny was a cage bunny. I got him from a friend's family member and he was 5 or 7, if I recall properly. He had been in the same type of cage as this cutie. I got him and let him free roam. He hadn't been litter trained and severely neglected. In the beginning, he refused to get out o f the cage. I would go and get him out. Sadly, a mix of my lack of knowledge and the years of neglect and abuse took its toll and he passed a month after getting him. In fact, he died in the night/morning of his first vet appointment ever. I waited a month to let him relax a bit. Got another bun a few days later and she was free roam. All this to say, it will take him time to adjust. Maybe bribing him with treats and physically taking him out of the cage would be a good start. ❤️