Sketchy deal.
I went to look at that car back in June when it was here in Arizona. The guy lived in Mesa, and even then it had about the same mileage. It was pretty beat up. Carfax is clean, I can email if anyone wants it. PM me.
Check out his original FS thread.
http://www.nsxprime.com/forums/showthread.php?t=123883&highlight=1991+black
Don't know how or why the car ended up in Missouri or wherever it is now.
Here are pics when I looked at it. Did not drive it. A few looks was all it took to turn me away, but then again he had it priced at $19k back then.