There is nothing at the listed coordinates
There is supposedly a treasure hidden in a cave on the southern shoreline of Swan Bay. The myth revolves around the pirate Bonito "Bloody Sword" Bonito, who raided the west coast of the Americas. His career began around 1818 but from there on sources differ. According to one legend his ship was boarded by a British man-of-war after Bonito exited Port Phillip after hiding a treasure in Swan Bay, apparently the so-called "Lost Loot of Lima", sometime in 1821. He was subsequently given a trial and hanged.
S 38° 13.639' E 144° 39.198'