I posted this on
CorvetteForum, but since this thread sent me an update alert today, I figured I'd cross post this here as well.
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The following internal GM reports summarize production totals through September 1969. The Daytona Yellow ZL1 was ordered September 7, 1969 and completed assembly per the trim tag on September 11, 1969 (N11). I don't have a reference as to what GM's official production date was for the Daytona Yellow ZL1 (presumably either September 11 or September 12, 1969).
Here is a copy of the two documents and my analysis of these two documents: