My 1st ( now the MRS uses it ) CASS rifle was a pre safety limited edition Rossi fully engraved, saddle ring, special wood, lever carbine in 38 / 357... had a couple handling dings, but the action was still unfired crisp... it really doesn't have any more dings, after a year of CASS, but has now slicked up nicely... I paid less for it than for another comparable rifle, so I felt no guilt using it... my ( new ) CASS rifle is a newer model stainless & brass lever gun in 45 Colt... I'm pretty sure that one was unfired as well, ( as the firing pin was defective ) but that one shoots nice now, after it's been repaired...
honestly I'd shoot the golden spike, in conditions that wouldn't damage the rifle, I see that all the time, they make so many commemorative lever guns, it's unlikely any will ever be worth more than the base gun in good shape... at least within the owners life time... same could be said for some revolvers... I also have a NAA Mini "snake eyes" edition, with the case, cards & poker chips... I actually have shot the gun enough, that I often carry it on my poker nights, or to other formal functions, where the tiny gun slips nicely into a pocket...