Crimson Octagon Key
Located directly beneath the main spawn crest. Look for a small red octagonal object on the floor below the central spawn table.
Emerald Club Key
Hidden on benches to the right of the main table, underneath scattered books. Look closely at the bench seats for a green club-shaped object.
Golden Diamond Key
On a decorative vase placed on the staircase banisters leading to Floor 2. Look for a gold diamond sitting on top of the vase.
Azure Star Key
At the top of the back-right bookshelf on Floor 2. Requires either the Max Jump gamepass or the Crimson Key to reach.