What is the source for the death place - Sulawesi, Tengah, Indonesia for Martin Bombach (Brumback) b. 1724 Nassau, Germany, lost at sea aft. 1770 with a shipment of iron.

This is the death place on many on-line Martin Brombach family trees with no source listed. Is this family lore? Or does someone have proof of his death in Indonesia..what was the name of the ship? Any further info would be helpful.

Thanks.

Pat