That's a good question. Chevy sales info for '69 is unclear on certain colors.
Probably the earliest source of sales information generated was the Showroom Album. All of the standard Camaro colors are listed but several are noted "check availability before ordering." Those were 10 Tuxedo Black, 40 Butternut Yellow, 51 Dusk Blue, 61 Burnished Brown, 63 Champagne, 67 Burgundy. Later sales info omits 10, 40, & 63 but lists all others with nothing noted.
However black cars were built at both plants from the start of production; some are 10 10 some are - - paint codes. Black later [Jan 1?] became an RPO [regular production option] extra-cost color: $12.65.
At some point 40 and 63 became RPO colors. I recall seeing a notation that 63 was always RPO at Van Nuys. All of the 40 cars I know of were built after January 1 at either plant; 63 seems to be the same at Norwood.
To answer your question the only colors that MAY not have been available at '69 production start up were 40 & 63.