I wont spoil it for those who don't know already, but JK did post a small game to discover it on her site.
If you go to jkrowling.com, click on the eraser and you will be taken to a room - you'll see a window, a door and a mirror.
In the mirror, you'll see a hallway. Click on the farthest doorknob and look for the Christmas tree. They click on the
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