Enclosure size is one of the issue among a few other. Here is how to ensure that a small BP that size will eat.
1# downsize the enclosure (this is temporary), get a 6 quarts or 15 quarts tubs.
Buy some aspen bedding for your tub, make it deep enough that your BP can bury himself in it.
Get some PLASTIC flower pot saucers (1 or 2 depending on the tub size) they should be 6 to 8 inches wide.
Stabilize your temps there is too much fluctuation on the warm side and make sure they do not go above 88/90 (you do not want him too hot)
2# Put him in his new enclosure (no more handling from this point until he easts 3 to 5 meals for you).
3# Wait a week and offer a live adult mouse about the size of it's girth.
His refusal is husbandry related and a few adjustments will put you back on track.
Note: having a snake means being prepared to feed live, right now the priority is to get him to eat for you.
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