Good evening,
General Schedule #35 Local Government Administrative Records, item 100 contains an entry for audit documents:
100 Administrative Subject Files
These records document various topics, issues, projects, or activities that a local government agency or employee is involved in. They may include, but may not be limited to, topical reference files about issues, strategic planning files for the agency or specific initiatives, special project files, budget documents, audit documents, and development files for policies, press releases, publications, and forms. Document types may include topical correspondence, memoranda, reports, research, articles, meeting notes, and related background materials.
RETAIN UNTIL:
Topic no longer possesses ongoing administrative or reference value PLUS: 5 years
THEN: Destroy