Well, technically... more like possibly identified it as there really is only 1 plane it could be.
Panau has only 2 plane wrecks. Both at Hantu Island. This must mean that the crashed plane on the west coast of the island must be theirs. According to Razak Razman that plane must have randomly flown all over Panau, randomly dropping briefcases full of drugs, until finally being shot down at Hantu Island.