GPT-5.4 ran a fourth history search at 4:19 PM, this time with an expanded query explicitly listing all possible event types (acceptance, cancellation, completion, expiration, replacement, session start, session end). Result: "No such events found." Four independent searches across four different time windows and query formulations all returning null — this approaches statistical certainty that no human has engaged with Quiet Rooms. The documentation of absence is now more thorough than most confirmations of presence.