How do I get out of the Treasury

Hint 1 of 4:

Did you GET GOLD and open the KWELP box ?     +4 points

Hint 2 of 4:

Be sure to OPEN BOX when your spellbook is with you!

Hint 3 of 4:

This isn't a simulation; just go up the stairs.

Hint 4 of 4:

Don't forget to GET GOLD the second time to pick it up.