It is quite possible that a Pirate Ship ran aground off Harbor Pointe during a Hurricane or trying to evade a ship from another country in pursuit. Some of the pirates then loaded the chest in a long boat and took it up the Bayou but the boat floundered in the storm or they were about to be overtaken by opposing sailors and the chest was tossed over the side. Who knows, it may be true but it is doubtful that any more such chests would have been dropped in or around this location!
Frank