I got one of mine back after 2 weeks if waiting !
All did was put a little plastic tank on its side with the little door open .. left it on the corner of the snake room with a little bowl of water AND a tiny 5W heat pad underneath the tank .
I went in one morning and the little LTR ( Ratsnake) was lying curled up in the tank ( with the little food still open ) .
You could try that and even put a thawed fuzzy mouse in each day
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