The full O'Higgins Report is available here: https://static.rasset.ie/documents/news/ohiggins.pdf
First impression: Alan Shatter and Martin Callinan are owed a massive apology by Enda Kenny, who effectively wrecked their careers.
I'm surprised O'Higgins isn't more damning of Brian Purcell's bungling:
13.169 On 26th February 2013 the commissioner sent a report to the secretary general
addressing the letter of 20th December 2012.
13.170 Mr. Purcell told the commission the report was not furnished to the minister:
...but, yes, it should have gone to the minister as I said not necessarily when it came in straight away but following appropriate attention or consideration in the Garda division and then if it came back up the line it would have then in the normal course of events it would have either gone or there would have been a discussion with the minister at that stage but for whatever reason that didn’t happen.