Having that full package and a LNIB gun, $1k would be the minimum at auction IMHO. Full package guns a bringing a nice premium these days.
This one went on GB for $985 yesterday, no box or docs and not quite as nice shape as yours.
Smith & Wesson Model 18-4 K22 Combat Masterpiece, .22LR, 4" Barrel - Revolvers at GunBroker.com : 887292523