BD did some tests on old nylon a while back, but the link I saved isn't valid any more.
The takeaway I got out of it was, if stored away from sunlight and chemicals, old nylon is pretty much as strong (breaking strain) as new, but the loss of elasticity in dynamic ropes over time was questionable. (in other words a 20yo unused rope would probably give a harder catch than a new one.
Can't quote the reference now, so take it as gossip.
Nevertheless selling gear that's 8yo as new is a no-no.
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