I saw this car when it was first listed on ebay: http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=270875955077
VIN is 124379N688125 for future reference.
From the ad:
"engine suffix HB, casting 3932388" - late for a 388 block. Possible, but late.
"This very early production '69 was built the 4th week of September (09D), 1968."
Both the engine and axle dates are too late for that VIN. Comparing it to other known ship dates, the car should have shipped several days *before* the 10/28. Having an original drivetrain dated after the ship date - that would be hard to have happen. And having it sold before the drivetrain was built - what dealer would do that - you just shortened the warranty period.
The broadcast sheet looks good. I'd have to conclude the POP is suspect.