Keeper of the keys

Teahouse blossom keeps keys:

There are the keys for my new apartment, the keys for my old apartment (that hasn't been taken over by another tenant yet). There's a key to my gym locker.

And there are a bunch of random ones, to things I haven't been able to figure out.

One I believe may be the key to my bicycle lock from college. Another one could be the key to the front door of my apartment in law school. Another might be the key to my parents' car, which was sold last year.

But I'm not positive. And what if I have to use them someday?

I, too, have keys to cares that have been scrapped, my old safety deposit box, former houses, etc. I feel kind of funny getting rid of them. It's like throwing away your history. Except it doesn't make any kind of sense.