I sold one of my Jam Packs today. The person I sold the Jam Pack to wants to register the Jam Pack. I do not have the serial number. I threw out the box a couple years ago. I went to www.apple.com/register to logon and see all of the apple software I have registered. It does not allow me to see that. How and where can I see what the serial number of the legal software that I registered with is?