ADMINISTRATIVE LAW - RIGHT TO INFORMATION - REFUSAL OF ACCESS - NONEXISTENT OR UNLOCATABLE DOCUMENTS - request for CCTV footage concerning an alleged assault - whether agency has taken all reasonable steps to locate the requested CCTV footage - whether access to further CCTV footage may be refused on the basis that the documents do not exist or are unlocatable - sections 47(3)(e) and 52 of the Right to Information Act 2009 (Qld)