ADMINISTRATIVE LAW - RIGHT TO INFORMATION - REFUSAL OF ACCESS - NONEXISTENT OR UNLOCATABLE DOCUMENTS - request for documents generally related to a building works complaint - whether agency has taken all reasonable steps to locate the requested documents - whether access to further documents may be refused on the ground they are nonexistent or unlocatable - sections 47(3)(e) and 52 of the Right to Information Act 2009 (Qld)