Keep your eyes open but don't get overly stressed.
This is one of the big reasons we use quarantine setups.
There is minimal cleaning in a tub like that and minimal space for mites to hide and reproduce. You can easily wash out that whole setup in a washtub sink or bathtub.
Its been a long while since I have had a new animal but when I would get something, I'd usually do a little soak prior to caging, and I'd use Reptile Spray on the snakes and have them work their way through some type of damp cloth.
I think you will come out of it just fine even if it is the worst case scenario.
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