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The party page's "TIN on file" and the W-9 card's TIN copy the full, formatted number on click (right-click: digits only). The viewer reads it from the vault only at that moment, with the server's key file in force, never creates a key, refuses a key inside the books dir, and never draws more than the last four. A locked vault copies nothing and says why. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GWVo7x3UHw5kwCUaWxiejX