You are assuming you know the identity of 'my contact'.....
Actually, he is not my contact, just a very reliable source of information. He has merely stated he has seen scans (that purport to be) of the site and they show what seems to be areas of approximately the right size and shape to be crates.
Unlike many, he doesn't post opinion as fact so a degree of bet hedging is inevitable.
I am fairly sure that anything pulled out of the ground in that area will be more of curiosity value than anything else but I hope I'm wrong!