I think the papers tell more about the breeder than the dog. A dog doesn't need papers, but a breeder does. If a breeder is registered with the AKC that means they are following some MINIMUM standards, and the dog is more likely to be a purebred. Since the AKC cracked down on breeders, puppy millers are looking for alternative registries, and many have cropped up. Here's a link to registries, and what they do.
Registries
They say:
ACA - American Canine Association Advertises that over 3000 adult breeding canines are registered each week. Only registry endorsed by Petland. **Caters to commercial breeders.** Refers puppy seekers to pet stores.
I think this means that at one time your dog was sold at Peland. This is another problem I have with pet stores, they aren't looking for long time homes for the dogs, they don't care if someone is qualified to make a commitment, they just want to make a buck. Anyway, I hope Cooper gets all the love he deserves.
Here's some more information about finding out where your dog came from:
Free Puppy Report