My friend who breeds BPs contacted saying he knew a guy who had a bumble bee male who hadnt been taken good care of and wanted to know if I wanted it for free to give it a shot (pics below). He doesn't have room and can't risk taking in any unknown snakes. I got this snake and the most information I have about it is that its about 1.5 years old. It is however very skinny compared to my other pythons.

I currently have him in the other room than my snake rack in a 32 quart tub heated on 1 side to 91 and covered with a towel to try to give him some privacy. He doesnt seem to have a RI or make any weird noises. He explores the bin and moves from the cool to warm side. Today I wanted to feed him and even though hes probably 3 feet long, I didnt want to give him something to big as he is probably weak. I ended up bringing home a medium-large mouse (hes not much thicker... ) and put it in the tub with him. He uncoiled and started searching around the cage. He even kept going straight to the mouse then looking at it and licking it but never took it.

I feel really bad because he is pretty skinny and think he needs some kind of meal in him. I killed the mouse and attempted to assist feed him but stopped unsuccessfully because I didn't want to REALLY stress him out.

What are all of your opinions of what I should do for him? Try a different mouse/color? Try a rat fuzzy because maybe hes a rat eater? Take him to a vet? I know BPs can live a long time without eating but he looks like hes already done that.

I would like to do the vet but all of them in this area (Miami) are very expensive.

Hard to tell how skinny he is in the pics but at the certain angle you can see his spine and not much meat on the sides of him.