According to palmyraarchive.org, it's unclear whether the Esperanza treasure was moved to the pirate ship with the Esperanza ... could still be out there, buried beneath the sands.

A dying sailor aboard one of Saint John's fastest port ships told a tale too rich for the ship's captain to ignore ...

It’d actually be quite hard to bury the sort of treasure that pirates were after. The idea of pirates hunting for gold and jewels is bit of a myth, as it would just weigh down the ship.

Jacques Cousteau deemed it "the most beautiful island in the world." Michael Crichton wrote "Jurassic Park" with it in mind. Robert Louis Stevenson may have based his classic "Treasure Island" on it.