I have in the region of 200 piano rolls in London. Classical emphasis, for example, lots of bach and beethoven. The piano player itself is long gone. The roll collection has been picked over, there will be no monetary high value items. If anyone wants the collection, we could coordinate, I am cratuki at the google service.
The Musical Museum in Brentford might take them off your hands. They have a large collection of fully operational and lovingly restored self-playing instruments.
There's also a piano player museum in Amsterdam, should they not be interested: https://www.pianolamuseum.online/en/