ADMINISTRATIVE LAW - RIGHT TO INFORMATION - REFUSAL OF ACCESS - DOCUMENTS NONEXISTENT OR UNLOCATABLE - request for complaint handling documents - applicant submits further information should exist - whether agency has conducted reasonable searches and inquiries - whether access to further documents may be refused on the basis they are nonexistent - section 67(1) of the Information Privacy Act 2009 (Qld) and sections 47(3)(e) and 52(1)(a) of the Right to Information Act 2009 (Qld)