Wait, there are reasons to shop for pets at P@H other than the fact it's easy to get to and the animals are fairly cheap? So we're going to ignore the fact that the vast majority of animals are bred in "factory" conditions with very little space, are weaned at a stupidly young age and generally treated very poorly? It doesn't matter if the individual animal is healthy and well socialised - you're funding an immoral industry.
By all means shop there if that doesn't bother you but please don't pretend that the "positive" side of shopping there balances out the negatives. It doesn't.
As for the breed - chances are even the store doesn't know what breed they are. They get them in as "russians" from the breeder and if they're not a mix/hybrid (which they likely are) then it still unlikely that the staff will know which breed unless they have independent knowledge of how to determine the breed from the colourings and such.
I've worked for P@H and was never told how to tell the difference or what breeds we got in and my boyfriend also works there and doesn't really know much about it.
All you can do is ask and hope they know enough to give you a sensible answer.