The creators of Coraline sent out 50 handmade boxes to some of their favorite bloggers. Each box is unique and includes items from the movie. Box #10 belongs to Stop Motion Magic and is possibly the best yet:
In addition to the letter, key, and autograph by director Henry Selick that is in each box, box #10 includes: two rat mouths, a 3-D viewer, and seven 3-D frames. Thanks for pointing this out, Jeremy.
You can see the rest of the boxes I've found to date here.
*Buy "Coraline: A Visual Companion" at Amazon.