can it be possible smith might have just put on whatever grips they had on hand at the time this gun was made???
Exactly this has always been true with S&W.
That belief has become very exaggerated, probably because of the very few exceptions we see discussed here.
S&W has literally scrapped TONS of obsolete parts thru the years. Bill Orr bought a
large truckload of obsolete parts in the 70s when the Factory did a large cleanup. He paid $10,000 and, as I recall, he made S&W deliver them to his store in GA! When they came in, Bill called Joe DeSaye at J&G rifle ranch and said "Have I got a deal for you!". Bill sold Joe enough barrels and cylinders in that phone call to recoup his $10,000, and had beaucoup left! Over the next decades Bill sold over $500,000 worth of those parts! He told me it was the best deal he had ever made, and he was serious.

He sold the remaining parts to Jerry. I don't remember how much he got. Jerry sold them for years and made money, then sold the remainder to Jack Frost, who is still selling them!
I once had dozens of Pre-War round butt K frame grips that were completely finished with shaping and checkering but did not have the oil finish applied. They lacked the 1/2" gold medallions but had the holes for them. I also had quite a few left panels only of that same style that were completely finished. I think I finally scrapped those for the medallions cause nobody would buy them.
As I said above, I have M&Ps with the extractors that have round ends on 05 changes that should have dowels. I am not surprised that they would not scrap completed cylinders and extractors, but most buyers would never notice that. When it comes to obvious features like grips and medallions, I don't think you will find many "out-of-period" features.