Thanks Bruce! Yes, I do.
Thanks to info from various folks, including Brian Norden, SlimRails, various posts on forums and some informants I can't name, I have good locations for:
NCO 4:2 - WP&Y
NCO 6 - WP&Y
NCO 8 - Huckleberry
NCO 52 - Nevada County NG
NCO 56 - Nevada County NG
NCO 72 - Alturas
I think that the only other surviving NCO passenger cars are the 12, 22 (aka first 4) and 71 that I am seeking. If there are others, would love to hear about them!
E