on place chest:
if player's tool is chest named "&c&lPremium&1&l Case":
set block to air
wait 0.1 second
set block to emerald block
wait 0.1 second
set block to gold block
wait 0.1 second
set block to iron block
wait 0.1 second
set block to diamond block
wait 0.1 second
set block to air block
send "&bOtworzyles &c&lPremium&1&l Case"
Nie jestem pewny czy zadziała ale spróbuj to wkleić do skrypty