I have a co worker whoms neighbor used to road race (if I remember raced in an olympic RR even) and apparently has all kinds of stuff in his garage, some of which never used. He told me he broke his rear derailleur on one of his bikes and the guy gave him a dura ace derailleur in box (for his mountain bike haha!) I actually asked him about it and he brought it in, turned out to be an early 80s AX "aero dynamic" dealy, sure enough never used with box.

So im sure there must be quite a lot of old racers whom have quite a bit of stuff laying around too.