At one meeting at least every six (6) months, the agenda shall include the item: “Review of the minutes and recordings of all closed sessions that have not yet been released for public review, and determination of which minutes, if any, may be released.” Minutes shall be reviewed in closed session and shall not be released unless the corporate authorities of the Village find that it is no longer necessary to protect the public interest or the privacy of an individual by keeping them confidential. As to any minutes not released, the corporate authorities shall find that the “need for confidentiality still exists” as to those minutes. Minutes of closed sessions shall be kept indefinitely.