Having dealt with mites twice I would have already gone scorched earth on them, but then I have 80 snakes in my collection so waiting to treat is not an option.
Any new snake I get has its QT enclosure, paper substrate, and hides treated with permethrin (the insecticide in PAM/NIX/RID) the day before the snake arrives, and I wipe it down with Reptile Spray when I pull it out of the shipping box. If it has mites I know it within a day.