Eh, probably just sitting on a USB key on Tim Cook's desk with a Post-It note attached saying "DO NOT LOSE". I'm also guessing that they routinely send out to

Eh, probably just sitting on a USB key on Tim Cook's desk with a Post-It note attached saying "DO NOT LOSE". I'm also guessing that they routinely send out to Kinko's to get copies of the source code / signing key printed out for backup. (sarcasm)