How rare is a 68 GSS?

I have a friend who is a very well known vendor in the Mopar world who has 2 440 Darts, a red one and a black one! He bought the red one for his wife and the black one for himself brand new, but they haven't seen the light of day in decades! As a matter of fact, I have only seen the grille of the black one because both cars are completely packed in by boxes from his business!!! I have been bugging him for years to actually get one out, and the promises are always plentiful, but he is so busy helping y'all that he doesn't "have the time" to dig them out!!!