Where is his agency here?
Get a second box that is not broken. Put it next to the broken box.
Let Sencha decide which box to keep. He’ll choose the one he wants. Discard the other one.
You just know the cat will go to the new box and complain when you touch the broken one.
Masking tape. It’s paper and glue, eco and cat friendly and will provide him the structural support today’s modern feline requires in loungewear accessories.
It’s not broken. It’s just customized
Your cat looks exactly like my first cat. Sweet girl lived 18 good years by my side and your picture has my eyes tearing up. 🥺😭
All good, she passed a few years ago. No longer mourning, just tugged my heartstrings a bit.
Based on the fuzz on the torn corner, he likes rubbing on the broken box. I’d leave that one for him for a while as-is, replace it when he doesn’t use it anymore.