Hidden vin mystery?

[69gold/rsZ]

I have a 69 10A-68 LA gold, brown top, white deluxe int., and a matching number drivetrain. I have a POP, sales agreement, court doc(ticket for loud exhaust),that was factory chambered, pay off records, pictures, and original key knockouts. My concern is the vin on the dash (9L503244) is the same by the oil filter and top of tranny and all match. I took the heater box off and there is no vin there. The top of the cowl is stamped (8L103028)and want to know if anyone can tell me why it is like this? This car was painted blue in 1983. There is gold paint under the blue. There are original chalk markings on upper cowl. I had a body man look at the cowl area and the body. He has 15 1969 Camaros and 5 1969 Camaros in restoration process. To his knowledge he says cowl has never been removed. I know you can't see the car to make judgement but all body panels, 1/4s, and deck lid are stamped with H codes. On the cowl in front of driver is stamped H/9C. Some people who have not seen car think cowl was removed or replaced. If this is the case 68 vins start with 300000. In a previous post there were some cars in the LA plant that started vins with 100000 but not Camaros. Any help or explanation would be appreciated.