The Macquarie Mint $10 coin for $10 is a scam. After October 31st 2013 the coin has absolutely no value. In other words, they are selling these crappy souvenirs for $10 and promise to refund the $10 if you return the coin by the above date. They are hoping that a majority of the suckers dont return the coin.This coin is also only 50% silver content (according to the website)
Pity the poor people who fall for this one.