Not sure what the laws are in Australia. Not to make you overly paranoid but Aussie's seem to spend more time/resources on buyers. Make sure you clean house. Personally, I'd do nothing and wouldn't even try for a re-delivery. Sucks to lose money but like Old G said, not worth it to push the envelop.

Again, that's just me. I'm a bit more risk averse....aka chickenshit.