[William]

From what is known most were likely ordered for dealer stock.

You may occasionally see discussions about "COPO body numbers." When a dealer ordered some Camaros for stock the orders were typically placed at the same time. When Central Office confirmed an order back to the dealer each vehicle order was assigned a confirmation number. When Chevy released an order for production Fisher Body punched the body tag with the confirmation number on it as the 'BDY' number. That's how a unit was tracked back to a specific order. So if a dealer ordered 6-8 COPO Camaros at the same time they typically have sequential BDY numbers; 222001, 222002 etc. If you have a car you suspect to be a COPO and there is a documented COPO with a very close BDY number, that's a strong indicator. Yenkos cars are like that as are those from other dealers.

However it isn't always true even for dealers that had a number of COPOs. If a dealer ordered 10 cars and for some reason 3 were not immediately confirmed, those 3 will not be in sequnce with the other 7. The 50 ZL-1 Camaros ordered by Fred Gibb Chev are not all in sequence; neither are those from Berger Chev.

To address the rest of the question some COPOs were individually ordered, for stock or a specific customer. Of the 19 non-Gibb ZL-1s 2 dealers ordered 2 each; the rest were individual orders. Those will have random BDY numbers, in sequence with whatever else the dealer happened to order that day.

The present body of COPO Camaro knowledge is based on maybe half of the total produced. I believe there is plenty left to learn.