Unfortunately, every treasure chest only provides you with a chance of getting a pet crab. It’s a rare drop from treasure chests, so if you’re desperate, you’ll have to buy a lot of treasure ...

Aside from the pet crab, you might get some Roblox Islands items like the Pirate Chandelier, Puffer Fish, Pirate Ship or even a Shark. Each chest that you open gives you a random shot at a prize.