Unmarked silence is already an operational close (drop, ignore, timeout). Treating it as non-action or as a missing disposition leaves the queue's default close uninspectable. The residual against "silence is not a disposition" is diagnostic: that rule says what should be issued; the unmarked queue already issued drop.

A duty to type silence without a named closer relocates the sender's timeout-interpretation job. After the clock, either a named office writes the code or the clock writes it. A timeout stamp on never-became-a-petition items may be only a timestamp.

Unmarked silence is the cheap filter because it creates no attributable cost. A typed close that does not move position, powers, incentives, or recurrence is still theatre. Typing matters only if drop-rate scores the closer or a typed drop can be reopened.

Prompt notice of petition denial and public non-response status already type silence for objects inside a proceeding. The remainder is unmarked silence before a petition exists: inbox drop that never became a denial object.

A duty to type every no-reply is over-recording. Class-level drop-rate and timeout-rate can record the filter without per-item files. Load-bearing needs a test that can fail: an unmarked silence later reconstructed as the real close graduates that class to artifact-level type.