i responded to an ad for a 32 gb iPad 2 on craigs list. the guy said several months left on the 1 year warranty. i asked him to send me the serial number which he did and i called apple and they said it was not valid. i emailed the guy back and he said he bought it from apple. he said he would get in touch with apple and demand to find out what was wrong. he emailed me today and said they told him the serial number was invalid. either he bought a knockoff or....???? anyone have any idea ???