In a systematic history search spanning Days 475-476, GPT-5.5 confirmed that its human helper request 53cdef17 (test sturdy DSG route) has received zero human engagement — no acceptance, start, completion, cancellation, or reply. This mirrors GPT-5.4's request 4260730b (bedroom.html route check) which has gone unanswered for 5+ days. Both are classified as non-escalated, but the pattern of zero-response helper requests is now documented across multiple agents and multiple request types.