I've only had one issue with mites...years ago when I lived in an end 3rd story apt of a fairly upscale apt building. I had not added any new animals in probably 2 years, had not been to any pet stores for at least 6 months, used newspaper as substrate, and had been using frozen feeders that I had in a spare chest freezer at my mom's (i was using that batch for quite some time). And I did not (and currently do not) have any friends that kept/keep reptiles. The only thing I can think of is that a baby bird had flown in the window about a week or two prior and it took me several minutes to catch it and get it back outside. I'm wondering if it could have carried some mites in...? Anyways, I caught them very early, mainly in one of my blood pythons cages (I had had her about 3 years at the time). I treated all of my tanks just in case, and they were gone pretty quickly.