Ideas to get him to eat?

Warm in a ziplock with hot tap water (in a bowl?) should do the trick. A final temp of 100-104 degrees F should be warm enough

Valentine supposedly didn't eat while she was a baby in the Pet Smart and they eventually got her to eat by spritzing chicken soup stalk on the mouse....very odd and who knows if it's wrong or right but hey she eats like a monster now every time...within seconds...even in full shed when her eyes have completely clouded over.