Pomoc z Case

Pomoże ktoś  jak dodać żeby usuwało jednego case po otworzeniu bo jak otwieram to zostaje?

on rightclick:
    if clicked block is chest of unbreaking 10 named "&d&lPREZENT OD KRÓLICZKA WIELKANOCNEGO" with lore "&f&lINFORMACJE:", "&b&lPrzedmiot Eventowy":
        cancel event
        set event-block to air 
    chance of 5%:
        drop 1 diamond sword at player
    chance of 5%:
        drop 1 diamond pickaxe at player
    chance of 5%:
        drop 1 gold ingot named "&6&lBryłka Złota x100" at player
    chance of 7%:
        drop 1 gold ingot named "&6&lBryłka Złota x50" at player
    chance of 10%:
        drop 1 gold ingot named "&6&lBryłka Złota x25" at player
    chance of 2%:
        drop 1 gold ingot named "&6&lBryłka Złota x500" at player
    chance of 3%:
        drop 1 gold ingot named "&6&lBryłka Złota x250" at player
    chance of 1%:
        drop 1 gold ingot named "&6&lBryłka Złota x777" at player
    chance of 3%:
        drop 1 chest named "&f&l&kO &7Magiczna Szkatułka Wykopalisk &f&l&kO" at player
    chance of 10%:
        drop (random integer between 2 and 4) of diamonds at player
    chance of 10%:
        drop (random integer between 3 and 5) of emeralds at player
    chance of 5%:
        drop 1 nametags at player
    chance of 100%:
        drop 64 cooked beef at player
    chance of 5%:
        drop 64 cobblestone at player
    broadcast "&f&l&kO &6&l%player% &b&lOtworzył Prezent Od Króliczka Wielkanocnego! &f&l&kO"
        
on place:
    player's tool is chest of unbreaking 10 named "&d&lPREZENT OD KRÓLICZKA WIELKANOCNEGO" with lore "&f&lINFORMACJE:", "&b&lPrzedmiot Eventowy" 
    cancel event