Jon,
I´m not counting the cars who was destroyed in accidents, only the true pace cars from -89.
Test mules was from -88
And yes, i do know plenty of them that still haven´t got any miles on them yet, still in plastic and some of them are for sale.
For example, i know they have 3 or 4 of them in Canada that are brand new.
Then you can count it how you want but there was only 1550 made -89 and those numbers are correct.