I have a lot of vintage shaving stuff ... no, never!?
I do use it all, though ... and when something comes to the end, it will be fondly remembered but ultimately forgotten. Empties like vintage splash bottles will stay where they are in the cupboard or display until a replacement is found - that's either another of the same or something new, but when it gets replaced the old one will be discarded and only in special circumstances kept or sold on.
That's mostly about bottles, which empties to get collected by folks ... some of whom are happy to collect without ever having used the contents. My soap bowls get used and re-used, whether that's the correct soap or just another one. Razor sleeves, cases, packets, tucks and other packaging gets discarded when the razors are spent. I've seen folks collect razor sleeves in like stamp books, which is maybe a nice thing if you're so inclined.
So, I suppose I'm saying ... once spent, it's discarded ... and that's for new, nearly new, vintage or antique. Unless it has a continued purpose, like a soap bowl.
What I do have in the loft is a sort of pre-bin trunk - it's a large plastic trunk on wheels (as you can buy at B&Q) and I just dump stuff in there that may or may not be useful or ornamental going forward. It's got all sorts of things in it, from novetly Christmas gifts to commemorative stuff that comes with special edition films or games (less so now in a nearly fully digital age), ornaments, stuff, things, trinkets and what-nots. You know, stuff.
Periodically, I'll have a rummage through and chuck away a bunch of stuff or maybe even press some stuff back into action ... kinda like a personal charity/junk/antique shop in my own loft. My Grandkids love looking through it!
No reason why you couldn't have stash box or set of stash boxes with various grades of junk.
Thing is, it's organised then ... I know in an instant, with every room what's important, what's not, what I can just walk away from and what I can move on at any point when a new reason or purpose comes along. Use or ornament. Otherwise, space ... which I enjoy. I do actually lead a quite minimal and uncluttered life.