Foam?! No, no, no! Lord no. Try putting some hay in a toilet paper roll. Or hiding treats in the ball.
Don't use a puppy pee pad!!! You have already said that your rabbit chews everything, so it would probably chew the pee pad-which would be VERY dangerous since it could cause a blockage.Also use a puppy pee pad so to absorb the urine and makes clean up easier.
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