Wade
i just purchased a similar car to yours from the US (i'm from Australia) and yes we do pay more out here. Mine was a similar cost to your's and i will have it landed in Aust for about AU$48,000. I have seen similar Mach 1 390's in Aust advertised for over $60,000 so i think your car (if it's as good as it looks in the pic) would be a great buy. In fact, if i didn't purchase mine, i would have been keen to look at yours.
Don't know why the person who got scammed would send the car out of the country before they had the money. I actually didn't think it was possible because i had to have the title signed over (after i paid for car) before i could apply to our Customs to have the car imported.
If you want to send me some of your car's details i will gladly post it on some of our Mustang Sites in Australia.