Do you hoard "proof"?

Maybe for instance you hoard movie tickets-to really prove that you did go. You keep the tickets up your sleeve in case someone invalidates you or something of the sort? Or hoard/collect things that prove that you "lived?"/existed? I'm no too sure how to word that one but like...that you did things. Or that things happened. Like you need physical tangible proof? because otherwise it's like...you never existed at all? or something? I don't really know!

I've been analysing this behaviour in myself and I think it stems from some sort of gone haywire defence mechanism for me. I can't think of other examples but if anyone does read this and relate or think they relate-please share! I'm very interested in if others do this or not & would love to hear anyones stories if they're willing to share. I remember a friend hoarded candy wrappers from when she grew up in Japan before moving to the states.