I have a cousin who buys pictures with some identification, and then locates descendants. He mails the pictures as a gift. They have been thrilled to find pictures of ancestors they have never seen. This is a dawning process.
That's a great thing to do. I've found a few ancestors' photos on Find-a-Grave.
I would love that.
I have a box of pictures inherited from my Grandmother, unlabeled - other than ‘just for fun’.
Probably not relatives, but who knows?