re: arbitrage - where is the profit? paperclip,
that's from a confirmation point of view. As long as the cheque is received by 4pm on the 31st, you have no problems. If need be, I'd jump a flight to Perth to deliver my cheque (get them to receipt it), that of course is if the disparity between 'ordinary' and 'options' becomes overly appealing, and cost-justifies the trip.