Nostalgia I suppose. They're on the rafters in my workshop. I can look up and see the first car I ever bought (A '64 Ford Fairlane), the last car I've sold as of yet (a 2005 Chevy) and all the cars in between. I like the feeling of attachment to my past.

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Yes. I still have all of my drivers licenses too; including the paper one that I was issued before we switched to photo licensing.