Ask for a picture of the exhaust. Just something I observed with my car, the exhaust gradually transitioned colors with track sessions. I think my car had ~500 miles on it from the previous owner and the exhaust was the plain titanium color when I bought it.
Unless you are looking for a concours car, 1700 miles is nothing, even if it is all track miles.
https://f80.bimmerpost.com/forums/at...5&d=1601784706
https://f80.bimmerpost.com/forums/at...8&d=1597554336