I used to pick the shells up for next to nothing,certainly large enough to make a guitar body,walk around any fishing village you see the shells here and there,they are powerfull animals when you have hold of them in the water,the one in the pic will probably be sold fist thing in the morning at market,hence the hole drilled in its shell with the cord passed through,tether it at the side of the boat overnight,turtle tastes fine but the eggs are better