What does it mean when a listing shows "Not Specified" under vehicle authentication?

This means the storage facility hasn't recorded a verified run-status (such as "Runs and Drives" or "Engine Start") for that vehicle at the time of listing — it's an absence of data, not a confirmation that something is wrong. It often shows up on vehicles that arrived too damaged to test safely, or simply haven't been processed through verification yet. Treat it as unknown rather than negative, and lean on photos and any other available fields.