The National Missing and Unidentified Persons System (NamUs)
This is a case of a child John Doe from Michigan.
The case is as obscure as obscure gets but the authorities are interested in using genetic genealogy for the case. Source:
Retired chief hopes new DNA test solves 40-year mystery | WOODTV.com
Most of these cases have been taken up by the DNA Doe Project but this is a child and they don't work on those. The other cases they haven't taken up, at least for now, are these two:
The National Missing and Unidentified Persons System (NamUs)
The National Missing and Unidentified Persons System (NamUs)
I assume the police department there is sufficiently oiled as none of the cases taken up by the DDP required fundraising. Marcia Bateman was a sort of pilot case with a successful resolution before they decided to utilize the technology for other cases. There are additional cases from that general area on NamUs not mentioned in the news article, but I think you have a good chance of getting some of them.
I'll add a case I'm personally interested in if you can woo the police department to entrust you with the case.
The National Missing and Unidentified Persons System (NamUs)
Morgan County John Doe (1998)
This guy was some hungry transient.
His cardboard sign really gets me: ''Stranded Hungry

God Bless''
I admire the humility.
Someone killed him, apparently for no other reason than they could.