It is my opinion that the cut was never sent back to PSA/DNA to begin with. I think the whole story was concocted. If it were true, they would have
already removed the cert from their database by now.
A few years ago, the card pictured below was listed on eBay and was the topic of a thread on the PSA boards. Yes, PSA really graded that card a 10. Of course all the PSA apologists wanted to make excuses such as it was a mechanical error or the card was switched out, blah, blah, blah. PSA contacted the dealer and wanted the card back. If I remember correctly, PSA and the dealer couldn't agree on terms and the seller refused to give it back. So, PSA simply removed the card from their database - kind of like sweeping the problem under the rug. I don't know where the card is today or if PSA ever obtained possession of it, but my point is that PSA pulled the cert immediately because of the attention it drew. Likewise, they would have done the same thing in the case with the Cobb cut. I just don't believe the whole story.
