Opening Japanese Pokemon 151 Booster Box Feat. Sabrina! Guaranteed SAR and Masterball Reverse Holo! So I was thinking about buying a japanese booster box or two for my birthday. I like the fact that you're guaranteed an SAR SIR and they're cheaper and I enjoy the better Here are the guaranteed hit rates per box for Shiny Treasures #pokemon #pokemoncards #pokemontcg #shinytreasures #fyp Japanese Base Set Booster Box Loose Packs Trading Co.