Yeah. I'd have to give the original owner a share.
Do you think the person who bought it at the yard sale knew what it was when he bought it, or found out later?
They said it was bought in a group of old photos. I would think it was no intent there and was just a yard sale find of a photo collector or reseller. I'm ok if you don't know yourself, and the one still to be auctioned looks more like a group photo then a baseball card. I have seen hundreds of those that are worth between $50-200. This happems to be the one off of the first baseball team ever.
I have an 1880's or 1890's cdv of an Native American baseball player. The first Native American pro was from maine, but I can't prove either way if its him or not. There are only a handful of pictures of him, and a new one would be BANK!! It came in a box of postcards I bought at auction, so there's no guilt if I hit the jackpot!
I have contacted a couple of people who do facial recognition for courts, but they need several photos of the person and a very large check!! I tried the "History Detectives" with no luck. Until I get to the baseball hall of fame and let them check it out, it's just some hidden history.