A shame really.

Best luck I had with found film in a Box Brownie was from the 1950s with some early Ilford film. Two images clearly showed an elderly couple in their garden.
Another was a more recent film in an Agfa Clack showing someone's holiday snaps from Italy.

Gene M from westfordcomp has a lot of experience developing found film:
http://westfordcomp.com/updated/found.htm
At some point he had two pages of results from some rolls of an Argus C3 taken by a GI who was stationed in Italy towards the end of the war.