After a thorough investigation, I have found where the crabs are in Blue Bay.
But I still don't know where the stolen coconuts are. I'm certain they've stored them in multiple locations. These crabs are pretty smart...
It seems they're planning to transport the coconuts and hide them somewhere in the sea. They haven't started transporting them yet, but it won't be long before they do. We have to get the stolen coconuts back before they transport them into the sea.