If there were such maps, most likely the parchment/papyrus/paper etc. which the map was drawn on rotted to dust. The Carthaginians would of not given it to the Romans, yet anyone else for that matter. If they found a way to come back and forth from America to the Meditteranean (which I myself find hard to believe) and found out how to communicate to the peoples there, they would have a monopoly in trade, as Carthaginians were more concerned with money and trade than many other things......