I think that's much more of a concern when buying a gun that is old or not in production anymore, and certainly so if it's a real collectible. If I was buying a current production gun, I'd prefer to have the box, true, but I wouldn't be concerned about the manual since I could easily get one online. I wouldn't even worry too much about the box on a current production gun, especially from S&W or Ruger, since the boxes are readily available...and they will send you a new one for free (I have gotten them from both companies myself.)