we've seen MANY , MANY "collectors" ?? ( owners) sell off their grips , if they don't like them , or even buy up another gun, just to get the grips off it, have been for years, since the 'second' gun was made most likely........yes, as said above, it comes under the "personal use" ,your gun, do what YOU need, want to make it work for you... now,in the case of ANY one selling fakes (perpetrating a fraud) or whatever, then "caveat emptor baby" and shame on them, if they get too big, the company 's lawyers will give them a "cease and desist", Colt and Ruger does that all the time, they want to sell you ( the maker) a copy right license, to sell their stuff.......besides, grips come under the catagory of "accessories" it's NOT the actual product itself....until you mark them as such, and yes, maybe "technically" the medallions could be construed as "marking" in the event of " advertised resale"(not for YOUR personal use), hell, thats for the lawyers to decide, yes, the good old "cease and desist"....
usually works as their lawyers work for them ( on retainer or corporate counsel), whatever, you could not never try and keep up with them in any litigation..............