Phoenix in the Ashes wrote:
And I definitely think the mirror will play a role somehow by the way - no clue how.
i'm not saying the mirror won't play a role, but i find that when i'm writting my book, and i stop writing for a while, i forget things that have happened, and when i remember, i have to work it into my book somehow. so i think that jk might've just forgotten about the package after a while, and she remembered it after she finished the adventure thingy, and she wrote the part about harry finding the mirror and breaking it so she wouldn't have to change the adventure.