There are a lot of these on sale at the moment (1 Sept 06) due to a bulk buy deal that was concluded recently in Perth. These cards have been sold to buyers throughout the country. Some have appeared on ebay.
The warranty for these cards is only for the original purchaser and is NOT transferable (I checked with the supplier).
Regardless of whether the receipt is supplied with the card, you will not be covered in the event of the card's failure.
A helpful hint - these cards were not shipped in XFX's traditional X shaped box.