[cypher]

It just means he will be a cross between a Campbells Russian & Winter White (Russian), these two very close species have been interbred for so long now that all pet shop Russian hamsters are almost guaranteed to be hybrids & the individual species are only available from good breeders.
These two Russian species are the only ones that can be cross bred.

The person you bought him from was obviously misinformed & didn't know much about the different hamster species which is often the case!