Just googled to see if the wire wheel hubcaps were original then found a video of probably the same car 9 years ago. It had 16000 miles back then. Definitely could be 41K original miles if this is the same car.
Yes, we have seen it before, so miles are probably correct. http://www.stationwagonforums.com/forums/threads/1977-malibu-classic-estate-wagon-18500-miles.37769/
I am always carping about the bland beige and browns of 70s cars on this forum but that is one good looking wagon. That is some asking price though.