I had my FFL back in the 80s and early 90s and used to see these advertised all the time in Shotgun news, etc. I sure I had picked ALL of them up back then because they had really unique special features.
Those grips won't need much to take care of what looks to be scratches in the finish.
Get yourself a bottle of Birchwood Casey Tru-Oil, and then mix a little with mineral spirits to thin it down to a 50/50 mix. Apply a light coat with your finger, it may take a few coats, to blend it in with the existing finish. You're probably aware of it but those grips would represent $250 of the price of the gun.
I bought mine in 2009 for $650, and I thought that was a lot... as previously said, they have no where to go but up. These particular guns represented a ground breaking change for S&W N-Frames at the time. It was the first factory produced round butt grip frame done on the N-Frame, prior to that a round butt N-Frame was only available from custom gunsmiths.
I paid $800 for mine a few months ago, but it has a couple of "flaws." The previous owner installed a weird front sight that I don't care for, but I suppose I can live with it. And it didn't have the original grips, but an ugly set of aftermarkets that I replaced with a set of Altamont "Cokes." Also it's a -6, with the lock, so that hurts the price. There was a -3 like the OP's in the case at the same time, but it was $1200. I figured for $400 less, I didn't mind lock that much.
On the other hand, it did come with the box and papers. I've fired it a few rounds, but haven't had a chance to go to the range in months.
The 29 on top is supposed to be a Lew Horton special, I have no proof it is only what I was told when I bought it. When you shoot it with full house loads it's kind of like laying you hand on an anvil and allowing some one to smack it with a hammer. It is now a .44 Special to me.