CONGRADULATIONS ON SOME VERY INTERESTING ITEMS
THE ARMOR APPEARS TO BE FROM FISH BELONGING TO THE TRIGGER FISH FAMILY "BALISTIDAE". THE LARGEST IS THE TITAN TRIGGERFISH "BALISTOIDES VIRIDESCENS" SO IT WOULD BE A GOOD POSSIBILITY IF IT IS FOUND IN THOSE WATERS. I AM NOT AWARE OF THIS TYPE OF ARMOR BEING USED ELSEWHERE BUT IT MAY HAVE BEEN AS THESE FISH ARE WIDELY AVAILABLE THRU OUT THE WORLD.
IN NORTH AMERICA THE SKIN OF THE GARFISH WAS SAID TO BE USED AS ARMOR AS WELL AS ARROW QUIVERS AND POINTS BY SOME TRIBES.