The coastal wreckage in Tawi Tawi was under investigation by local authorities in Malaysia's Sabah region Monday.

The finding was reported by Jamil Omar of Borneo, 46, who says his nephew made the grim discovery in September, but didn't realize what it was as he has no access to television or newspapers.

"There was a skeleton still in the pilot's seat. The pilot had his safety belt on and the communication gear attached to his head and ears," Omar told local police, Free Malaysia Today reports.

The youth and pals found "many skeletons" in the fuselage, Omar said, some still wearing seatbelts, and more human bones nearby.

The teen also allegedly swiped a piece of fabric to use as a blanket, only to discover later it was a Malaysian flag.