I'd cancel the vet appointment- there's really no reason for snakes to go to the vet unless something is already wrong/they are already sick. Vet trips or any outdoor trips are just going to stress them more.
Just leave him alone for maybe 4~5 days, no handling, and offer food next week. If you offer food too early and while he's still settling, he has a less chance of taking the food too. His behavior seems totally normal for being in a new place for one day.
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