Wow, that’s an awesome find.
This one reminds me of the Atocha find years ago. The ship’s manifest made it over even though the ship went down, and like nearly all the records from the imperial period, survives in the archive in Seville. So, some of the gold bars found on the wreck were weighed, and their weights compared to the weights given for the bars with those serial numbers aboard the Atocha. And they matched. That’s how they made the positive ID on the wreck.