I still have the one and only Colt 20 rd mag that got lost in the bottom of a duffel bag when I ETS'd.
More sentimental than anything else and I still bring it out and use it.
Those limited edition Free Colorado pmags are stuffed away in a box somewhere. I have a Free Colorado flag at the bottom of the basement stairs. Covers up the water meter that someone thought was a perfect place to install (at the bottom of the stairs).