How do you open the Jewelry Box?

Hint 1 of 9:

It seems you have found another item that requires a key.

Hint 2 of 9:

If the initials A.M. do not mean anything to you, yet, then you
are not ready to solve this puzzle.

Hint 3 of 9:

Have you been on the roof?

Hint 4 of 9:

Did you notice the small balcony from the roof?