I think I passed an edit-review audit today. I rejected something that was so horrible I was sure it was a honeypot. But nothing happened. I checked in the history and yes, it was an audit. I can't find it now, to link to it, but I found another one that I didn't even notice at the time. The one that I went back and looked at had a more memorable edit-comment than the one I've linked to.
So, if you pass the audit there is no "congratulations" as there is with the other audits. Should there be? What happens if you fail?