No interest? At all?
I'm sure people are interested, but your price ($750 AUD / $730 USD / $750 CAD) may not be attractive to some considering shipping is extra and most can buy a 6990 for $750 brand new off the shelf...myself included, so by the time it's shipped internationally, it's worth more than a brand new card.
Considering it is USED and has been an OC'd Mining Card, you may want to reconsider and try sell it for 'Gaming-Card-Prices' rather than 'Bitcoin@$25-USD-6990-shortage-pricing'.
Just a thought.