The best way to do this is to order it from an ebay store. The promotion only works with "buy it now" if i recall. Like i said, go to the hardforum and read up on it. The live search stuff is legit.
For anyone wondering, i just ordered 3 items using this today. 2 of the cashbacks were instant straight to my paypal, and the third one is pending in my cashback account. It'll transfer after 60 days.