I'd say it's very likely, especially if you're finding adults now. Definitely let the breeder know since it's your only snake.
BTW this study is old but the info is still good, and while it will give you more info about snake mites than you really want, it will help you understand why they can be tough to eradicate.
http://denardo.lab.asu.edu/publicati...snakemites.pdf
ETA: Also read up on quarantine practices, especially if you get another snake in the future. I put new arrivals into a treated, minimalist enclosure and they get wiped with Reptile Spray when they come out of the shipping box. If critters arrive with mites I'll know within a day.