Among other stuff, there was a bunch of Italian modernist art from the 50s-70s. It was literally decomposing in there, and my mother sold a few pieces at auction at about the 25 year point, which was then used as a reference point for the value of the collection as a whole, and as evidence that she was acting maliciously, that she knew the value of what was in there.
The owner died in the early 90s - the folks who rocked up were the grandchildren of her ex-husband.
As for people who have said “oh she should have charged for the storage” - that would have been nice, but that wasn’t the agreement, and French law treats a verbal agreement as a contract, and also places the onus in this type of situation on the person holding the goods to make extensive efforts to contact the owner and/or their heirs.