I used to tear through old bins at charity shops and develop film left in the cameras.
Over the years I’ve only found 4 rolls of film but they’ve been marvelous. Here’s one roll in a disposable camera that was likely several years old when I got it developed in 2012 or 2013.
The Photographist 
I absolutely adore this, it’s when you find notes, letters or tickets used as bookmarks in library books or second hand books. Interpretations of a stranger’s private moments give them a second life.
I absolutely agree!