if you have the original receipt and you are still within 14 days of the *original* purchase date (the date the original owner bought it from the apple store), run, don't walk, to your nearest apple store. unless the original owner already claimed it, you may be able get $200 back if he paid $499/$599 for the iphone. if he already claimed it, you probably won't get anything, even the $100 store credit - when the details on the $100 store credit steve announced are released next week, i'm guessing they will use serial numbers to track who has received a partial refund (for those within 14 days of purchase) or the credit...