ADMINISTRATIVE LAW - RIGHT TO INFORMATION - APPLICATION FOR ACCESS TO INFORMATION - REFUSAL OF ACCESS - NONEXISTENT OR UNLOCATABLE DOCUMENTS - scope of application included text messages sent or received by agency officers on work mobile telephones - whether searches of backup system are appropriate or required under sections 29 and 52(2) of the Right to Information Act 2009 (Qld) - whether agency has taken all reasonable steps to locate documents but the documents cannot be found or do not exist - sections 47(3)(e) and 52 of the Right to Information Act 2009 (Qld)