User blog comment:Bears&Memes/Total Drama: Ridonculous Despair Chapter 1 - Daily Days/@comment-25106086-20170101202252

I think I know the answer to the safe puzzle.

The rabbit keychain is Bun-Bun, Josee's lucky rabbit foot, or at least something resembling it. That means the clue is meant to point towards the Ice Dancers.

Now, let's think back to the Ridonculous Race. There were 18 teams competing all together, and out of all of them, the Ice Dancers placed 3rd. In other words, their placement was "3/18", which fits the sticky note clue.

Therefore, I think the code for the safe is 3-1-8!