I disagree with your definition. If a firearms is new, in its original box, with (if applicable) the original paperwork, and unfired, I would consider it to remain NIB as long as it remains unfired and it hasn't had a scope mounted. If the plug screws have been removed and a scope mounted, I would consider it to be ANIB.
Jeff
Well go buy a Rifle from a Gunshop.Walk out the door and come back in to trade it in.They will give you used value for it.Same as buying a Car new.You buy and do not drive it,it still is considered used and will be valued that way.