There is only one moment in Book 3 Chapter 11 and there are a total of 5 items. Starting with the first level of zoom, we have the Dunbar Oglethorpe Chocolate Frog Card.
In the second level of zoom, pick up some Spellotape.
Pick up the Bauble.
You can unlock Gobstones.
Last but not least, pick up some Homemade Mince Pies.