How can the king's dresser be of any use?

Hint 1 of 12:

First of all, you should take the music box that is on the dresser.

Hint 2 of 12:

Then explore the dresser itself.

Hint 3 of 12:

The drawers hold nothing of importance at this point, until you discover
another object.

Hint 4 of 12:

Look at one side of the mirror; there is a note.

Hint 5 of 12:

The note reads something about "open up, don't shut down, go right in, don't
be left out" or something like that.

Hint 6 of 12:

Could this carry over to anything within the vicinity?

Hint 7 of 12:

Possibly the drawers?

Hint 8 of 12:

Open and close the drawers until the top and bottom are open and the middle
two are closed.  The next hints are the exact procedure to solve this puzzle,
so if you want to figure out this puzzle by yourself do not go on.