Yea.....you got a nice deal. Mine was original with box & docs and was $450 about 2 years ago and I had to pop additional $53 to get the extra original mag off flea-bay.
IF....IF.....IF you have some 9mm ammo, go shoot that gun. They are amazing...decent trigger, mine shoots right where it is supposed to. I like it so much that it "overtook" my Browning Hi-Power as a range day favorite.
If you don't have any 9mm ammo, then another $500 ought to get you a couple boxes in todays ammo market.
Congrats on a swell find. There is literally nothing to be found around here....guns or ammo.
About your grips...I don't know for sure, but your box end label is marked "#12021" in the special features area. This could be a "special order" for the smooth grips. Notice mine has the standard checkered grips and nothing marked in the special features area. Maybe Mike or Jeppo will come along...these guys know more about S&W semi's than I'll ever know.