I would assume it would be applicable rebates through EVGA or manufacture rebates with EVGA the manufacturer of course, for which they may have records since you would have had to registered your card to recieve your rebate. I once did step up from two 280's to two 295's but none had rebates so not an issue.
Send them an email and ask them or call, they are real good a getting a real person to talk to you. EVGA, Corsair and Newegg are about the only retailers and manufactures I trust to actually sell you good stuff and give you decent support. The rest can pretty much go to hell.