Just a heads up.
Be careful as you go through airport security if someone steps in front of you and goes "beep" on the detector. This causes sufficient delay for the accomplice on the other side to help themselves to your belongings in the tray.
Hold on to the tray with your valuables in it until you are the next one through the screening gate.
It seems like Aussie thieves are onto the racket. Its been an issue in Europe for a while now, some airports there have numbered each tray and when you pick the tray up you take out a numbered token and then get your tray back on the other side when you hand over the token.
The "security" people know it happens but its not their job to prevent it