You should get the AKC paperwork alot with the vet records.

I dont’ know how to see the breeders page. I would like to see it.
$500 for a well bred purebred Lab is awful cheap. I would like to know if the parents have their hips OFA’d, and CERT for their eyes. Without those, I would not even consider the puppy.

The going rate for a purebred Lab from a reputable breeder would probably be closer to $1000. People who sell them for less save money by not doing these tests on their dogs.

Labs are very prone to hip dysplasia. Google it. It is a debiliating disease that can cost you a ton of money in the long run. While there is no way to guarantee your pup won’t develop it, you can drastically increase your odds by finding a reputable breeder that screens their dogs.

FYI- puppymills or bybers sometimes only breed one breed. There is much much more to consider than that.

Here are some great links to help you know what to look for in a breeder
http://www.woodhavenlabs.com/breeding/breeder.html

http://www.woodhavenlabs.com/articles.html
References :
owned by a Lab and 2 GSDs