"lost & found" not eating

I lost a young corn for 10 days. The only sign of him I found was a regurgitated pinkie. He had made a jailbreak from his feed cup and turned up in my girlfriend's apartment last night. Funny story, but I'll spare you the details in this post. Was very thirsty upon returning him to cage, but still refusing food. Probably got really chilled en route. How long before worrying?

I would give your snake 2 weeks before even attempting to feed it again. This will allow it enough time to recover from the stress of being lost and found, as well as it's stomach to return to normal after regurgitating. Offer your snake a small meal to start with. If your snake doesn't eat then, give it another week and offer it another small meal. Your snake can even refuse another weekly meal or two before you should start to become concerned, but I doubt you'll have to worry about that.