IF they are the only 2 snakes you have, and IF they have both been at the breeders, then it is too late to quarantine, as they have both been exposed to each other AT the breeders (if they locked up at the breeders, they have already been together.)
I agree, I can't see how quarantining would be needed if they have both been exposed to each other at the breeders house and then he is sending both of them to you.
When any new snakes come in beyond these two then you'll know what to do...