My suggestion would be for him to find a breeder, esp if he is thinking about raising them for sale.
I'd ask him what his plans are, does he want to raise rabbits for pets, rabbits for meat, check out the ARBA website for the different rabbit breeds.
Auctions are going to be hit or miss for quality, lots of "mutt" bunnies there, or they will label them as something and they're sooo very far from the breed
standard.
If I bought at an auction, I would skip young bunnies under 6 weeks, you want to look for slightly younger ones. Skip the older ones, they are there for a reason.
Bridgeport will let you go thru the boxes (or get there early and sit up front) You want to do a basic health check on anything you buy, check for poop butt, nasal discharge,
Run your hand down its back and check to see if its spiney.
The Bath auction is this weekend and lots of rabbit breeders send their "extras" there, probably going to be a step above what you might find at Bridgeport, I'll be there if anyone would like me to
give them a lesson on what to look for.