IMO you should try harder to find original owner.I lost my two GWPs for three days and it sure was a difficult time for my wife and me. I looked at many sites plus talked to everyone in the area where they were lost. I would imagine the owner is doing same. All they have to do is bump into the information somewhere. I would contact animal shelter frequently.
Perhaps you can go back to area you found the dog and ask locals? Let the Police, Game and Fish know. Run a news paper ad. Place found posters on bulletin boards in stores laundermats etc in area. Put up found posters placed on poles etc in area where she was found. Someone raised and is bonded to that dog and visa versa. The dog and the original owner deserve to find each other again.
Craig's list has a listing lost dogs
https://petfbi.org/?gclid=EAIaIQobChMIz8ap6c7U5wIVjtdkCh2QkQpZEAAYAiAAEgJFj_D_BwEType in "found dog websites" there are tons of sites pertaining to this issue.
