Hmm... I believe him... :/ How about takig more pictures with text editor and your name in it, paper next to the phone with your name in it, etc.? Put watermark there too. Also, screenshot the e-mail you received and post it here (press that printscreen button and paste in any image editor). I hope people will believe you now. =)

Also, it would make the auction more reliable if you could tell us how you got a final version when it's not released?