Once upon a time there was talk of Winchester going bankrupt and it was not known if there would be anymore 'Winchester Repeating Arms." I bought a model 94 at that time and never shot it, not being a hunter and living in a state that only allowed shotguns for deer which would be the only game to hunt with it. I didn't get a box with it, but it still had the price tag on it. $159 at Target.
30 some years later, I don't think being unfired would add more than $50 to its value to anyone else. It got stolen 2 years ago. I would love to get it back, but could not attest to it being unfired anymore.
Would it make more difference if Winchester ( or their successor ) had ceased to exist or had moved production at that time out of the country? Could be. I probably would have kept it I fired for another 20 years.
I say keep it another 40 years and see what the future brings. There are others to shoot.