Every now and then, I like to take the contents of my wallet and photocopy it. I put the copy in a safe place. Then I have a record not only of what is in my wallet (if it ever gets lost or stolen) but also of how the contents of my wallet change over time. It is surprisingly fun to look back at these old photocopies of IDs and membership cards, debit and credit cards. Though mundane in some ways, they tell a story of where I was and what I was doing, and even what I looked like. A slice of time preserved. Try it, you might like it.