I see no one has posted, and honestly I don't know how much help I'll be. I HAVE heard of little wood bugs coming in on substrate before, and from what I've read in the past they are harmless to your snake. I'd make sure they are not mites and clean them out anyways if I were you though....good luck! I hope someone else can post and help you out more.
Here's a thread I found by typing "wood bugs" into the search option:
http://ball-pythons.net/forums/showt...ight=wood+bugs
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