The ZL2 special ducted hood was not available at the start of 1969 Camaro production. Ordering information was released to dealers around December 1, 1968. The first ZL2 cars were built later that month.
Earliest known car built at Norwood with ZL2 is N569358.
Earliest known car built at Van Nuys with ZL2 is L513754.
If your car was built much earlier than these it could not have had ZL2. About 40% of the Camaros built with it were Z10s & Z11s because it was a required option. It was included with COPOs 9560 & 9561.
All the parts necessary to add ZL2 have been reproduced for many years. I added ZL2 to my Z/28 in the '80s.