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I only have two collections on my credit reports. Both are medical.
It is not uncommon for a creditor not to retain account information of a debt that they have sold.
Sometimes they pass everything to the new owner, and sometimes they archive and their reps dont take the time or know how to retrieve.
Regardless, if the OC is not reporting (or reporting accurately), then no issue of a dispute necessitiates their verification or validation.
It is the new owner who is pursuing active collection and/or reporting to a CRA that is of interest regarding validation or verification.
It is necessary for the debt collector to have adequate basis for validation or verification.
The fact that you were unable to obtain adequate info from the prior owner is not factual basis for contesting the accuracy of the collection or its reporting.
As to whether ot DV or PFD, that depends upon whether or not you contest the debt or wish to begin payment negotiations, whether you wish to place a cease collection bar on the debt collector as a reprieve from their collection activities, and whether any DV would be timely.
More specifically, a DV only imposes restrictions on a debt collector if it is timely (meaning it is sent within 30 days after their dunning notice), and even if timely, its effect is not to require validation, but rather to impose a cease collection bar until they have first sent validation. If timely, your DV imposes a cease collection bar, which prevents the debt collector from conducting any negotiations on terms of payment, such as a PFD or settlement offer. Thus, you may be in an extended state of limbo once you send a timely DV.
The post does not state that you contest the first collection or that any DV would now be timely. If not, and your primary goal is deletion of the collection, yu might wish to move directly to a PFD offer rather than send a DV.
Sending a DV is not always the best route. It depends upon your circumstances........