For some reason I still carry 3 keys that open a large number of salina journal machines. Never gets me any free papers though cuz whenever I'm in that area I'm someplace where somebody already has one. Not sure why I've never gotten around to taking them off. When I worked for them, I had over 30 keys with me most of the time.
Also got the mail key to my old apartment that I forgot to turn in when I moved.
Other than that, they're all useful. My truck, wife's car, dad's house, 2 truck topper keys (both the same I just realized). Don't have a key to my own house yet, but I never go in through that door anyway.