You could try mixing in some alfalfa hay. It seems like buns cannot resist the stuff! Mix some in with his Timothy hay and see what happens. I've done this with my boy in the past.
Have you tried contacting a rabbit rescue? You’ll pay an adoption fee but you’d be giving a home to a bun that could really use one. I volunteer at a rescue and most of ours were abandoned. I just want to bring them all home with me!
I’ll chime in and share that my Nahko was neutered at 5months and he recovered quickly. He’s still the loveable munchkin he always was. I know neutering is far less invasive than a spay. Just do your research on exotic vets in your area. I take him to a rabbit savvy vet that luckily lives 5 mins...
Our two floofs. Nahko the mini lop is free roaming all day and night with our cat Gidget. There visits were supervised at first. We made sure that she knew that he’s part of the family and not food. We let him free roam a few hrs at a time while we went on short trips to the grocery store, etc...
Buns do eat their own poop. SO it’s possible he’s just eaten some. I’ve caught my Nahko eating his stool often. I call it “second harvest” haha! Anyway, continue to monitor behavior. When he stops eating that’s when you really want to worry. You can always give the little one some pumpkin or...