Haven't seen the LS5 Desert Sand car, have to look for it. Desert Sand is the only color I don't have an Atlanta buildsheet for but LIGHT GOLD sounds logical. I'll keep looking as well but if you or anyone else finds anything (and remembers me), I'd appreciate the info.
Also missing a could of 9xx paint numbers for 1970 for Misty Turquoise and Champagne Gold and a ton of 9xx paint numbers for 1971 and 1972. See http://chevellestuff.net/research/want_paint.htm for more.