There is a Collectable Item hidden in Angry Birds Star Wars II Escape to Tatooine level P2-S1, heavily protected in the middle of the level. Since the platform hiding the Item is indestructible, Droideka must be flung over the platform and off the hovercrafts beyond. With a lot of luck, Droideka should pinball into the Bonus Box, though it may take a few tries.
Go back to the Complete Star Wars II Bonus Boxes Guide. If you have a different strategy feel free to leave a comment below.