Business records proving that a debt collector has either purchased or been assigned collection authority are not information that is required under FDCPA 809 in order to validate a debt.
If you have some evidence that shows they do not have legitimate collection authority, you could use that as a basis for disputing their collection, but a mere fishing expedition that requests documentation of ownership or assignment records is not a formal part of the debt validation process.
Regardless, a debt collector is not required to provide any validation, so if you assert for any reason that what they have provided is not adequate validation, you essentially asserting that the debt remains unvalidated. The result would be that if your DV request was timely, they remain under a cease collection bar. There would be no violation unless or until they resumed active collection on the debt without first having provided adequate validation.
You could then file a civil action asserting violation of the cease collection bar imposed by your DV, and get the issue of adequacy resolved by the court. I am not aware of any precedential case law that holds adequate validation under the FDCPA must include proof of ownership or assignment of collection authority.
