The Principal's Keys appear to be a low-quality photo image of two gray, metal keys hooked onto a key ring. Judging by the name, they seem to belong to Principal of the Thing.
Usage
The Keys can be used to get out of detention early, with a one-time use. However, if Principal of the Thing spots the player in any location (except the playground and his office) for more than a second while the detention timer is still ticking, he will scold them for violating the "No escaping detention" rule, making the use of this item very risky. It is best to use this item at floor 3 as the map is bigger. When there are 0 seconds left in detention, the keys will become unusable.
When locked in the classroom after Chalkles fully spawns or entering Mrs. Pomp's classroom while she is furious, the player can use this item to unlock the standard door as a getaway.
The Principal's Keys as seen in one of the faculty rooms in Baldi's Basics Classic.
In Baldi's Basics Classic, only one Principal's Keys item is found in the faculty room with the WD-NoSquee item and lots of red lockers. Also, the Keys can be used on any standard door in the Schoolhouse, though it simply opens the door, therefore being wasted. There is no benefit to doing this.
