Just been over to Expedia to check conditions on the 14 Day Aussie only tix. The fine print states - 'All 2-, 3-, 4-, 5-, and 14-day Disneyland® Resort Park Hopper® Tickets expire 13 days after first use or on January 13, 2013, whichever occurs first'.
Sorry - Looks like you only have 13 days...