A lot of long accepted history has been challenged by new archaeological finds and the use of advanced technological techniques used to examine artifacts. For instance, the Holy Cow of accepted historical fact that has been repeatedly slaughtered is that Columbus discovered the New World of North America in 1492, but modern archaeology has proven Lief Erickson led Viking settlers here long before Columbus, and other evidence now being explored points to a lot of other contact with Europeans and Asians in N.A. as long as 3,000 years ago.
As for Pirates burying treasure, they didn't use banks, and didn't carry it around with them, it would be difficult to spend it all no matter how bawdy a lifestyle they lived. There are plenty of accounts from those days about buried loot. Henry Jennings began the golden age of Piracy when he raided the Spanish wreck recovery operation near Sebastian Inlet, Florida in 1716 snatching 350,000 pesos ( peso = ounce of silver) then sailed for Jamaica and on the way sacked a Spanish ship for another 30,000 pesos. When the crew landed in Jamaica they were really living it up and blowing money like crazy and the British Governor freaked out and forced them to leave. Then Jennings sailed to an island near Puerto Rico and buried the main chunk of his loot there, which he may or may not have ever recovered. Check it out, the information is out there.
A lot of historians seem to be playing some kind of game about historical facts, and it pays to study enough to be able to spot these birds when they open their mouths and start singing their song of lies. Good luck in your research and treasure hunting! Cheers!!