I found this by logging into my Amex account, and it is listed in 'Offers and Places'.
Edit: Bank Issued cards can be registered at AmexConnect
DAVID JONES
RETAIL / Spend $250 or more, get $50 credit
Register by saving the offer to Card and spend $250 or more in one or more transactions at David Jones, in-store or online, before 31/1/14 to receive one $50 statement credit. Limited to the first 12,500 Cards to register.
OFFER TERMS
Offer only applies to spend on this Card. It does not apply to spend on any supplementary Cards on this account or any other American Express Cards you might hold. Supplementary Cards and Bank Issued Cards qualify as an Eligible Card only if they register for the offer separately at amexconnect.com.au .
Cardmembers must register by saving this offer to this Card and spend $250 or more on their registered Card at David Jones, in-store or online at davidjones.com.au, in one or more transactions, between 2/12/13 and 31/1/14 to receive one $50 statement credit.
Participation is limited to the first 10,000 cards to register.
Purchasing through online aggregators, e.g. Paypal is excluded.
Statement credit is normally issued within 3-5 days of the eligible spend, but may take up to 8 weeks to appear in your account.
Statement credit may not be applied to your Card Account if it has been suspended or cancelled and may be reversed if qualifying purchase is returned or cancelled.
General terms and conditions available here
Ya :)