My Coco refused to go in her box for two days because of her litter. She didn't like the pelleted rabbit litter, so instead we put her on paper bedding. If your new bun pees on the floor, wipe it up with a tissue and stick it in their litter box, same with their poops (you don't need the tissue...
My bunny doesn't like toys all that much, but, we bought her this activity center, and she loves to chew on all the toys and tassels! She even sleeps in there some nights. XD
https://www.amazon.com/Original-Activity-Zone-Rabbit-Toy/dp/B0052ZAR3I