ADMINISTRATIVE LAW - RIGHT TO INFORMATION - REFUSAL OF ACCESS - NONEXISTENT OR UNLOCATABLE DOCUMENTS - applicant submits agency did not locate all relevant documents - whether agency has conducted reasonable searches - whether access to further documents may be refused on the basis they are nonexistent or unlocatable - sections 67(1) of the Information Privacy Act 2009 (Qld) and sections 47(3)(e) and 52 of the Right to Information Act 2009 (Qld)