Excuse me, but if a breeder tries to sell a mix as purebred, it is already NOT right. I wouldn't trust AKC papers since AKC works with PMills/BYB. For instance, I know one yorkie who looks like spaniel, weights appx 14 pounds, but an owner have full registration papers and SURE that her dog IS STANDARD yorkie, and all other are teacup...
Also, if the parents "perfectly fine", it may be a scam. It is possible when BYB shows the beautiful dogs as a parents just trying to sell a mix.
My points is: Don't buy from this breeder. yes, this puppy IS cute, but many mixes in shelters have been waiting for homes. Please, don't support unethical breeders, who just try to make a buck.