The Washington Post's headline was intriguing: Great-Grandson's Questions Laid to Rest.
After Years of Research, Man Identifies His Confederate Ancestor's Grave.
Rather misleading title. No grave digging or DNA analysis was involved. The guy already knew where his ancestor was buried from a childhood memory, he just did not know his name. The article leaves out all the juicy details, such as how he figured out which of his four great-grandfathers was the one buried there (here's the one he ID'd: Charles Jones) and how we can check it out.
As for the "notarized affidavit," to have something notarized means that the signing of the affidavit is witnessed by a notary public. A notary asks for identification to ensure the person is who they say they are. Notaries are not responsible for the accuracy of anything. That means any of us can show up with a notarized pedigree chart to claim an unmarked grave. And the government will even thrown in a free tombstone.