Starbucks' Winter/Christmas Holiday Mystery Box Straw Topper (2024) --- Heart Topper Brand New/Never Used. Material: Silicone The heart topper is 1 of 6 possible toppers you can pull from their first ever, mystery boxes. All mystery boxes bought in stores, are unknown until you open them, as the SKUs are identical. And there are no external identifier on the boxes to indicate which one is inside. So if you don't like lottery systems/gatcha games, or you still haven't scored your heart topper, there's always this one!