It's not easy to keep them from jumping after a surgery, but it sounds like you are on it.
The cardboard is a good idea. It works, then can be recycled.
My prayers are for him to have an easy surgery which takes care of the problem once and for all, a speedy and complete recovery, and for you to have an easy time with keeping him quiet for as long as needed.
Please let us know how it goes!
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Love All Life, Thank You For Posting! :)