After you check the temps and figure out the weight, consider getting some b-vitamin supplements. I also work in a pet store, as well as a large scale reptile facility and here is the procedure I go through for Baby Balls that won't eat.
1. If they are living on the sales floor with the other ball pythons, immediately take them away, put them alone in a basic set up with heat, hide log, water bowl, and jack up the humidity a bit.
90% of the time, they will eat a fuzzy mouse or a pink rat within a week of that.
2. If it still has not resumed feeding, I begin giving it 3 drops of b-vitamins every day, and offer food every 3 days.
3. Still not eating, I offer them a fuzzy gerbil, sometimes they just can't resist.
4. At this point, while still continuing on the b-vitamin regime, if they have not eaten, I force feed them a pink rat.

If you do try force feeding, do not use mice, I have seen the lower jaw of a mouse splinter during force feeding and puncture straight through the neck of a baby ball python.

Good luck with the little guy, hope everything works out.
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Ball Pythons:
1.2 Normal
1.2 Pastel
0.1 Black Pastel
2.0 Het Orange Ghost
1.1 Mojave
1.2 Spider
1.0 Albino
0.1 Het Albino
1.0 Piebald
0.1 Het Piebald
Other:
0.1 Irian Jaya x Jungle Carpet python
1.0 Jungle Carpet Python
1.0 Tiger Retic
1.1 Burmese Pythons
1.1 Brazilian Rainbow Boas
3.3 Corn Snakes
0.0.1 American Alligator
1.0 Savannah Monitor
1.0 Chinese Water Dragon
0.1 Brown Basilisk
0.1 Sulcata Tortoise
1.1 Sugar Gliders
0.1 Puppy

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