Yup, they are in some huge warehouse somewhere up near Flint I believe. A friend of mine goes to get them in his car hauler.
If I do my car show again this year I am going to ask GM Heritage to send me the first SY or TY, GNX1, and some 3rd car...maybe a Hurst Olds if they have one.
To be honest, that Riv was 'unique' but wasn't my cup of tea. Had a sweet motor but the rest of the car was sort of blah.