I kept them all, including glider.
A simple line can evoke a hilarious story even 25 years later.
Pictures of Mates, planes, places, squadron stickers, a mention of a hairy approach or a stupid one, I can recall most of the better events or the last 20, 354 hours.
I don't plan on any interviews with airlines in the near future, but all the times can be verified with three phone calls, and it would probably add a bit to an otherwise boring chat session.