Imagine, if you will, the heinous crime that there awful - no, worse than that - atrocious monsters have committed. Those fiends broke into Father Kwismas' workshop and cleared it out before returning to the depths of their dungeons. Unless someone does something to stop them, the children of the World of Twelve will not be able to celebrate Kwismas this year. Do you understand what that means?
Offer your help.
Oh, I'm glad you're taking it that way. You can help by retrieving one of the boxes of presents stolen by those terrible fiends. Apparently, despite their abhorrent, unrepentant, soulless behaviour, they can be made to feel some remorse for their actions if Father Kwismas himself talks to them and asks for the stolen boxes to be returned. Perhaps you should try to pass yourself off as him, and if the thieves still aren't convinced, a good blow on the head should sort them out.
Ask where you should go look.
There you go, I've shown you which monster took part in the break-in. Don't forget to bring the box of presents back to me as soon as you've recovered it. If you aren't able to recover it, come back and see me in two hours.
Ask for a new key.
I see you have a Bunch of Keys. Give them here a minute. ... There you go, you can do the dungeon once without needing the key.