In the future, take a look around nasal passages, and the scales under the chin/neck especially. This is where you are most likely to see them if they have mites.

I pull my sleeves back any time I am at a reptile show, and if I handle any animals, they don't touch my clothes, just because I want any potential issues having less of a chance of hitching a ride home. I used hand sanitizer religiously, and if I buy an animal, they get a mite check and a respiratory check before I commit to anything.

Sorry about this whole situation. Better luck in the future.