I have noticed in the Catching Fire and Mockingjay book that a sticker has fallen out of my books. The first time I saw the sticker was
on the floor of my room and wasnt sure where it came from but when reading the Mockingjay book the same sticker fell out.
Its no ordinary sticker either. its 1inch by 1 inch sticker white on both sides until you peel the one side off and it has 8 silver lines going around the outside to form a smaller square in the middle. there is a tiny #5 in the corner as well