Only the media. Ok, you do the math. A fishing boat wandering around north of Australia and south of Indonesia is eventually discovered abandoned but with a hold full of fish. A few weeks later, one of the shipboard phones is found to have made many calls from somewhere inside Indonesia. The media, not being able to do any actual research since parroting press releases from law enforcement is so much easier, call it a mystery.
It might seem like one until you realize the seas around Indonesia and south China are riddled with pirates, and most commercial vessels, even really big ones like tankers, only have at most a dozen or two crew members.