There is none. The only thing anyone has referenced is some pre-PayPal code that got scrapped and rewritten in the merger and some games when he was a kid.
Look for his interviews. He mentions a software his organization wrote and sold, but the buyer didn't know how to fully take advantage of it. Kind of like flying an F22 as a cardboard box down the side of a grassy hill.
Can you elaborate? It's a big leap to go from vaguely describing something you read he said to then describing this hypothetical as a metaphorical F22.