Stumbled across this article from 2020, written about exhumations of does from the cemetery where Harper Jane Doe was buried (in a paupers grave apparently).
Police, FBI exhume bodies at United Memorial Gardens in Plymouth
"Last year, they focused on 21 cases and we were able to collect thirteen samples and submit them. It allowed them to help a man who submitted his DNA, hoping a relative’s match in a missing person database would help him find his mom. She went missing when he was a young child. Only now does he know, she was murdered.
“His mom didn’t leave him," Sgt. Jones said. "She didn’t just up and decide she didn’t want a kid anymore. Something tragic happened to her."
Sgt. Jones said letting that man know that means the world to her. She says if you have a missing relative you can put your DNA in the system and look for a match.
“He never gave up and this was in 1987," she said. "So even though it took 30-plus years, he now at least has his mom.""
IMO it seems likely they are referring to Harper JD. Interesting!