The Yearbook Mystery Box is an ex limited-time consumable released on March 13th, 2019 as part of A Classless Reunion 2019 Event. It is the biggest mystery box to date, as it contains almost all of the content that was previously released for the game.
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- During the March 14th update, the Yearbook Mystery Box's store icon had its end date removed, making it permanent, as there's no end date in the files.
- As of March 26th, 2019, the Yearbook Mystery Box was relocated to the Premium category of available items in The Store.