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Based on Japanese community opening data: 23 SR cards per box (guaranteed), roughly 1 SEC per box, 1 Leader Parallel per 6 boxes, 1 SP per 12 boxes (1 per case), and 1 Manga Rare per 72+ boxes (1 per 6 cases)

Shiny Charizard V is an obviously rare find

Each character's ace monster is included as an ultra rare in addition to a rush rare, making it easier to build a character deck

GEN 1 Best = Ghost-Normal and Ghost-Psychic (tied)

However, looking at the "Select Expansion" screen, it appears as though there's space for six different expansions, suggesting that this could be the maximum amount that will be available at any given time