so there was some 35 years of wars and half-wars in which those guns wore, wore out, were repaired and rebuilt. I would be surprised if any turn up with all original parts, let alone factory new.
Factory new condition, I would be surprised too. All original parts isn't quite as rare as you might think. A LOT of the 45s didn't get much use during those 35 years. Some did, some didn't. Some didn't even get carried very much, others did.
For instance the pistol assigned to the Plt Ldr of a supply company that didn't leave CONUS in those 35 years I would expect to be a different level of wear than one carried by a LRRP team in Viet Nam, and different than the one that has spent 1943 on in a SP holster guarding a gangplank.
Do I think they just crated up the 45s and shelved them when they adopted the 9mm? Actually, I think it is a strong possibility. Certainly gun lovers like us would want them all returned to pristine condition before storage, but I doubt the Govt did that. After all, it costs money. I'd like to think they did, but until I see evidence that it was done, I will have my doubts.