I have no idea whether Maiden as a journalist received special treatment or if your average FOI punter would get this sort of response to applications for documents for the last three years concerning 16 different topics, with sub-headings in most cases to spell out the detail. I would have advised against lodging all encompassing applications of this kind-shows what I know! Maiden clearly is not one of those smarties said to be artificially breaking requests into small parcels in order to gain multiple shots at five free hours of decision making time that some agencies are concerned about.
Some of the information sought was already in the public domain, or wasn't held, because for example the Governor General pays for her own clothes, hair and make up, and there are no separate records of dry-cleaning bills. Or was not matter of an administrative nature, and outside the scope of the act as it applies to the office, such as correspondence with Julia Gillard, Kevin Rudd and the Queen.
Government House only raised the issue of substantial and unreasonable resources when declining to produce original invoices but nevertheless extracted global information from records and provided it. Others might have been tempted to use these applications to test the limits of the diversion of resources provision.