While this post is not about lost baggage, we did experience a baggage kerfuffle at PHL. We arrived to our baggage claim (after spending a couple hours in a gateside lounge) and our box was nowhere in sight. We talked to the American baggage agent, who looked into it and said our checked bag took a different flight from LAX to PHL.
Turns out the box was put on an Alaska flight and hence the bag should be at the Alaska baggage claim. We walk over to find the Alaska baggage agent gone. Turns out he was rolling our box over to the American claim. He even remembers walking by us. Eventually, I got a call from American (with caller ID of private number) letting us know the Alaska agent was bringing our box back to the Alaska claim.
A bit of a wild goose if you ask me!