YGO TCG Flames of Destruction Special Edition - Rules of Play says:
Didn’t get enough of Flames of Destruction? Well each box of Flames of Destruction Special Edition includes 3 booster packs of Flames of Destruction, along with 1 of 2 Super Rare variants of sought-after cards as well as 1 of 2 Super Rare variant preview cards from the upcoming Summer 2018 booster set!