i didn't read the "use a golden key to get a stellar gem" and i opened the shadow water gem box and it gave me a random gem, and i have no clue how to get another box without unlocking uber 9 world, also i'm power rank 500 so i'm not getting to uber 9 anytime soon

hopefully someone can give me my box back, and remove the random gem from my inventory

thanks- Nofearzz :