America's Pet Registry is one of the "alternative" registries formed when the AKC adopted stricter rules and started requiring DNA testing. This registry was actually created by the retail pet industry so I assume your puppy came from a pet store. You can read how it's mission is to product the pet industry on its website:
America's Pet Registry - FAQs
Unfortunately, papers from this and other alternative registries don't mean anything. It just allows the pet stores to state that the puppies have "papers" so they can sell them for high prices.