Hi,
I'm not certain but they look a little like rodent bites?
If you look they seem to come in pairs all about the same width apart.
If they are rodent bites that hints that the snake may not be eating as well as they claimed.
If they sprayed the animals theres a high probability that they didn't use Provent-a-mite which is the most effective thing to use.
If you have this animal at home I would definately order some and treat not only the quarantine tank but the door into that room and the room the rest of your snakes are in and probably their enclosures as well.
But follow the instructions exactly as it is strong stuff - so much so don't use it if you have any insects you want to live like crickets or tarantulas etc.
But good quarantine is a definate must when taking on problem snakes.
dr del