If you have an extra 2,400 Happy Island coins burning a proverbial hole in your pocket, why not purchase the new Salvage Ship? The item costs just that, and can be placed in your archipelago view, where it can be used to search for treasure and rare items once per day.
Once you purchase the Salvage Ship, it will go into your Stash, and all you have to do is enter your Archipelago View (click on the globe in the top right corner of the screen) and place it there to give it a new home.
Each day, you’ll be able to have a chance to find new treasures and rare items, for free, as the Salvage Ship works. It’s a fairly cheap item, so why not head over to the game’s page to purchase one?