Asset Acceptance is a debt purchaser, not a seller of debt, so I would have to call someone a liar if the say Asset sells debt. Now the original creditor can "buy-back" an accout that they sold for various reasons, ie. comsumer filed banko, is deceased.
When it comes to debt validation, all the company has to provide is original creditor info, and balance info (principal vs. interest) the burden of proof is on the consumer to prove the account is not theirs, in most cases some sort of proof that the account has been paid prior to being purchased by Asset, or some sort of documentation regarding id theft.
Asset doesnt buy "junk debt" . Lets say the make a purchase from citibank they may purchase 1million accounts, now some of the accounts may be 10, 15, 20 years old but that would be a very small percentage of accounts, most accounts are within the statute of limitations for suit, Asset is a suit driven company, most of their profit comes from suits