Do you keep them?
I'm just in the process of having a sort out whilst the OH is away. We got married recently, I'm still in the process of changing my name and I'm literally the worst for keeping important things safe (I just found my passport in the bottom of my sock drawer and my car registration documents in a box with an electric drill and IKEA flat pack instructions!) so I'm attempting to get them all organised.
I'm pretty ruthless in chucking stuff out, I'm not overly sentimental, but I've come across some bits that I don't want to get rid of.
What do you do with such things?