I would be very careful with not feeding hay or the bunny not eating hay because I just had a friend that had to spend hundreds close to 1000 on her bunny because he was only eating pellets and he ended up getting kidney stones... he ended up getting very very sick and started losing weightWell... I've had 4 rabbits in my life before him. Two lived in a hutch in my garage when I was a kid. One in my high rise apartment in the city when I was in University, and one in a house after school with my roommates. None ever got hay. Like EVER. So Im not worried about death.
He has been eating pellets and twigs/bark/branches. A slice of banana, and one cracker in the past week.
It is hay that has Timothy, Alfalfa, June grass and other grasses. Quite a bit of alfalfa and Timothy. I get it in bales and 5 x5 rounds because we have a barn and animals.