You can find a nearby Justice of the Peace to certify copies of documents and witnessing statutory declarations through the Lawlink website: HERE. The NSW Justices Association has a list of JP community desks including Barangaroo, Downing Centre, Supreme Court, Sydney Town Hall One Stop Shop, Broadway Shopping Centre and Kings Cross Library: HERE   

Some staff and volunteers in my office are also JPs and can help.

Note that the department is not accepting any applications for new JPs until April.