I would suggest waiting 10 days or so. Thawing out the rat, warm it a little with a hair dryer, 30-45 seconds or so. Offer the food in his living enclosure, there is no real need to feed in another container. Moving him back and forth may be causing enough stress to regurg. Feed hin in his enclosure and let him stay untouched for 72 hours. If he doesn't hold that meal down then you may need to see a good reptile vet. I'm going to put in my 2 cents worth about vets here. I live in south east NC. We DO NOT have any good reptile vets here. I took my burmese to the best one I could find, (he was the best because he is the only one that would see him). He suggested to spray him down once a week with frontline to make sure he never got mites. I don't remember all the other STUPID things he suggested but I took my snake and got the @%$*! out of there. Just the other day I had a customer call me for advice about a sick snake. I called Exotics by Nature in LA. They said they take their sick snakes to LSU's vet program and they use them as demos and do a real good job nursing them back to health. NC State has one of the best vet schools in the country, 2 1/2 hours away. I called them to discuss this possibility with them and guess what, they DO NOT treat snakes. This means they are not teaching their vet students anything about snakes, this means when they graduate and open vet hospitals all around NC and SE USA they will not treat snakes. All this come out after reading over and over on here to "take your snake to the vet". Congrats to all of you that have a good vet you can take your snakes to, around here I am almost better off to play vet myself!
Off the soap box now!
Fat Boy
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