I Didn't Receive My CookieRun: Crumble - Idle RPG Pre-Registration Rewards

The CookieRun: Crumble - Idle RPG pre-registration rewards are delivered to your in-game mailbox.

Please note that the mailbox feature is unlocked only after completing the Clear Stage 2-1 quest. 

If you have not yet unlocked the mailbox, please continue progressing through the game until you complete this quest. 

Once the mailbox is available, you will be able to claim your pre-registration rewards.