I have often thought a castaway would try to leave some form of "diary" of what happened to them. They had charts, pencils and probably other papers. But who knows how much time they had to unload the Electra of everything that could be useful? Would paper even survive long if not sealed into something waterproof? It appears they got the jackknife onto the island and I would bet the axe made it too but that's a handy tool for any islander to pass up. Like anything else they saved, the islanders could have used it and likely did as evidenced already in so many TIGHAR investigations.