They maynot be reptile mites, could just be wood mites. Check the fold in the middle on the bottom of the jaw of snake. Reptile mites love to hangout there. I stopped using cypress bedding years ago because it always had woodmites. Although they are not really dangerous to reptiles who want little crawley things in the house.

I'm not saying for sure what they are but its possible they are not reptile mites.