First you do need the metal detector.
Go to the desert. Now do you remember when you have to bury the chest in the desert from
frankie fusilli? Around that area i want you to look on the right hand side where there's
three little bushing that looks like a triangle. Look around the the area with the metal
detector you move the handle around when the green button flashes when it does and you see
the chest shape thing. That's the chest dig it up. Then give it to someone or sell it for
$6.000 in the shop there's nothing more you can do with that chest
Best wishes
Candycrush