This article contains spoilers from One Piece's Final Saga. The Straw Hat Pirates got the Thousand Sunny using Adam Wood. The chances of the Straw Hats getting a new ship are close to 0.

Launch One Piece Grand Arena and enter the server. After you spawn on the Thousand Sunny ship, hit the "123" button next to the Settings icon. This will make a code box titled "SERIAL CODE" appear.