L.A.
My husband is a photographer and forensic photographer.
He asked if they are color or Black and White?
Gloss or satin finish?
If they are color with a glossy finish, soak them in plain water for a few minutes until the seperate, then place them on a very clean towel till they dry, they will probably curl, then place a clean sheet over then and lightly iron them on a low setting. They can now at least be scanned to make copies..
He says if you have a steamer, you could attempt steaming them .