I have seen a couple of Review Audits for First Posts and Late Answers. They are very easy to by-pass.
While reviewing a First Post or a Late Answer, I obviously expect them to be posted very recently (maximum of about 30 minutes ago on Stack Overflow; maximum of about 3-4 hours ago on Ask Ubuntu and similarly on other sites based on different parameters).
However, all the audits I have seen for First Posts and Late Answers (on Stack Overflow) had a timestamp of about 15-20 days earlier. So, the Review Audits are pretty easy to by-pass if a reviewer keeps a watch on timestamp alone.
See one example each for First Post and Late Answer:
- First Post: http://stackoverflow.com/review/first-posts/1600868
- Late Answer: http://stackoverflow.com/review/late-answers/1608254
Note to Reviewers: You have forgot whatever you read just now!!! Whoosh!!