Hi...hoping I joined the right forum & you all can help me!

I work at a small chain pet store [we don't carry reptiles or anything, mainly just sell supplies] & when I got to work yesterday morning, my boss showed me a shoe box that was left outside the door & inside it was a baby ball python. Nobody at my job likes reptiles & I was afraid at what my boss would do with the snake if nobody took him...so I reluctantly said I would take him home [i say reluctantly because even tho i love reptiles & have had them before, i am currently 8months pregnant & a new pet isn't something we need right now lol ]

Anyway, so I have him & luckily for him we had kept all our reptile supplies & hes in a nice viv & has adequate lighting & heating...I have a 100w zoo med powersun lamp [those $70 bulbs!] on him for daytime & a low wattage red bulb for night.

Ok...so the issues...he looks pretty skinny, you can see his spine which I don't think is normal & when I held him he doesn't seem to have a very strong grip.
Also the thing that concerns me the most is he makes this whistling noise now & then...seems to be mainly when he is on the move...I can't see any mucus or discharge...any ideas on that?

I left him be yesterday & he immediately found his cave & spent all afternoon & night resting. Same with this morning, I saw he was out basking when we got back from shopping about an hour ago so my fiance got him out just to see how his temperament would be getting him out of the tank & he seems ok.
He stayed in a ball with just his head out, but I was able to get him to explore a little...thats when I noticed the whistling noise.

I have never owned a ball python...only snakes I've had are corn snakes. Any advice for me? I plan to feed him every Thursday, is that enough being as hes underweight? How do you get a snake back to a healthy weight?
How about handling them? They act a lot different to corn snakes, so am finding it a lil hard to read how hes feeling...when he was in his ball with just his head out, it made me a lil nervous he was waiting to strike at me or something

Here are some pics, hope they work! We've had a few bunnies & kittens dumped outside our store, but never a snake! Sad...especially as this was early morning when he was found, so it was freezing cold outside!