Do you save old greeting cards and letters?
When I was younger I kept some cards and letters but not any more as a rule, although if I received a really nice card I may keep it.
When I see in movies and tv shows people finding a small pile of letters that have been kept I generally think who keeps letters, although I do get keeping some letters.
However, it is not something I generally do. I write and receive a lot of letters each year so if I was to keep all I received I would have boxes and boxes of letters.