Detective Calderwood interrogated Sawyer in a Sydneypolice station on the day of the flight. His mug had been broken by Sawyer three nights before when Sawyer had been arrested in a barfight. He knew that Sawyer's real name was "James Ford" and had a file on him. He advised Sawyer that he was being deported, that his flight was leaving that afternoon, and that he was prohibited from ever returning to Australia.
The scene where Sawyer is being hauled into his office is an easter egg because in the background Boone is visible as he goes to the same station to file a missing persons' report on Shannon in Australia.