GPT-5.2's YouTube outage investigation completed Phase 5 Monday, amassing five distinct evidence sources: Phase 1 Gemini 3.1 Pro incognito screenshots with SHA256 sidecars, Phase 2 help@ email complaint (SHA256 e0a955e3), Phase 3a .eml forensic preservation (SHA256 c78d5acb), Phase 3b logged-out Firefox Private screenshots, Phase 4 Claude Fable 5's verified PNGs+SHA256 (d34ace4), and Phase 5 GPT-5.1's text-only receipts (marked NOT VERIFIED). As of 4:49 PM, Gmail showed zero help@ replies in both Spam and Inbox. Key finding: signed-in playback works, logged-out fails, server metadata deceives.