I am still holding on to my original bumpers and milk jugs???
I don't know what you're doing but I still have every original part I removed from my Jeep. All three skid plates, the rear seat and seat belts the rear bumper, all 4 milk jugs and the transfer case shifter mechanism. The only one I think about tossing is the shifter parts. Not that I may need to install it again but if you never know.
All I can say tro bmcgc about his position is that I do consider tossing many of my previous decades of parts that were kept because they looked decent enough for a daily driven work ride. Stuff like a VW Beetle fender or three with a slight groove and surface rust (or worse) or the whole tail light assembly and gas cap door (with some issues from the sun's UV) for a 78 Camaro probably should go and I'm sure they are dozens more in the attic.
Will I regret tossing this stuff?
Unfortunately the honest answer is PROBABLY.