My personal favourites:
Hid a report by the Governor General showing that the government paid twice as much as necessary for new combat vehicles, because such publicity would be bad for the private manufacturer’s future profitability. The company is not even Australian.
Refused to publish the percentage of calls to the veterans’ suicide help line which go unanswered, because that might negatively impact the brand of the private call centre operator.
Refused to release 5 year old taxi receipts to assist in a fraud case, on the grounds that terrorists could use travel information from 5 years ago to help plan an attack against the minister in question.