Yes, I can prove it. About 10 years ago. A good friend of mine, who I call uncle Vito. (Who is a retired Secret Service Agent.) Uncle Vito asnk me if he could borrow a metal detector, because he lives near where site #3 is now located. He told me that he heard of Spanish coins being found on the beach near Melbourne after storms.
I lent him the detector. About a year later I visited him on a trip from up north to Key West. He showed me one of the Spanish coins he found. It was dated 1714.
So yes I have seen proof and if Dr. De Bry said, that he found coins on the same beach? I believe him too.