I've attached the "confirm" page, which has the shipping quote code in it.
Here are the parameters that it uses
$Shipping_Parameters["ShiptoZip"] = "".((isset($_POST["shipping_postcode"]))?$_POST["shipping_postcode"]:"") ."";
$Shipping_Parameters["ShiptoCountry"] = "".((isset($_POST["shipping_country"]))?$_POST["shipping_country"]:"") ."";
$Shipping_Parameters["AusPostServer"] = "http://drc.edeliver.com.au/ratecalc.asp";
$Shipping_Parameters["CarrierCode"] = "STANDARD";
$Shipping_Parameters["ShipperZip"] = "5046";
Looks like it uses only the postcode and country, but not state..
I'll attach the checkout page too so you can see the form.