Just a warning for anyone selling their old watch on some well known auction website. Lock it down, don't delete it from your apple account when you post it. Follow all of the guidelines strictly on postage (shipping) and when the buyer says it's locked, then remove it from your account. You might even state on your sale it will be sent locked and not unlocked until received.
I sold my 3, followed all of the guidelines and when I saw online that the buyer had signed for the item I unlocked it. They even left positive feedback. A week or so later came the chargeback through their credit card company. Paypal removed the cash from my account and the three month investigation started. They upheld the buyers claim, but as I had followed all of the correct procedures I got my money back, but the buyer got it for free.
It would appear crime does pay, just make sure you are not the one paying.