It's a very simple matter for them, with a photocopy of your passport, to list your use of the exemption on the computer. Either that or they will stamp your passport physically when you come through the airport.
Beware of this free thing (nothing in life is free) the express services still have to process the exemption forms through customs. Also, they charge up to $4 per kilo to bring it here.
Hopefully there will be an anouncement soon from me regarding this.
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