This is the procedure I go through when getting a new ball (and I will be getting a Lesser probably on Thursday who will meet the same treatment). It may work for you, it may not, but I kind of picked it up from reading around on this forum. Hope it helps.
1. Upon getting the snake use a mite killer on it, the bag/box it was in, etc. Kinda like a de-lousing procedure to reduce the possibility of an infestation.
2. Put the snake in a tub that is already regulated to have the right humidity and temps at all times, but still monitor the temp/humidity to make adjustments if need be (I use Acu-Rites for this).
3. Ignore that the snake exists for 2 weeks. Well not exactly.. keep a close eye on it's habitat, make sure you don't see signs of RI or a mite infestation and always change its water, but other than that, leave it be.
4. After two weeks try feeding it an appropriate sized prey item (10-15% of it's mass) to see if it will take it. Prescent the area for it, come back shortly later and do the zombie rodent dance, then hope it strikes. If not, wait a week.
After about a month of this if it still hasn't eaten then I'd go to the store and buy lives for it to eat. In the end something always works.
The crutial thing is that the snake needs to get settled in before it will eat. Make sure your husbandry is all okay and then you shouldn't have a problem.
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