The Oglesby Union is the heart of all things related to student life that does not entirely involve classes or dorms. At the Union, students can reserve spaces for events, attend concerts, go bowling, etc.
You are looking for a magnetic hide-a-key container. As this is the Union, use extreme stealth as it is muggle-heavy. There are plenty of places to sit at though at GZ, so you can give the illusion of sitting around waiting for something.