Safe Combination

It's written somewhere inside the room.

pass1

"Y" is written somewhere inside the room.

pass2

The different colored areas are hollow.

pass2(cont'd)

Translator here, this puzzle relies on how much Yen is worth.

Yen Coins go in order from 1, 5, 10, 50, 100, 500.

Yen Notes go in order from 1000, 2000, 5000, 10,000.

Hopefully this helps you out!

pass3

The paper has writing, try making it appear.