Is it just me or my age, I find stuff I forgot I had, so it might be me, but there is stuff I can’t find, then find it months later. There is stuff that never shows up again, Like my reading glasses, tore the house apart looking for them, never to be seen again.
Also I have bought stuff only to learn I already owned them 
It’s little gremlins, pixies, fairies, brownies or whatever you call them that steal or hide your stuff. I had a half of bottle of pills disappear in my small apartment and searched the place top to bottom with no luck.
I downloaded a movie on Amazon the other day only to find I had already downloaded and watched the same movie a few weeks ago. Scary.
As far as stuff goes, I like to go through my things and get rid of some regularly. I don’t like clutter.
My husband, on the other hand, has a hard time letting go and has boxes of stuff I’d like to throw away… But he’d probably look for an item months later and I’d have to confess.