The tracking number comes from the carrier/postal service - they are working in partnership with paypal (I can't give you exact details becuase I don't live in the US).
And there is plenty of opportunity for fraud in this whole process. The whole empty box/brick through the post is a well used trick on both sides.
There are avenues of appeal through PayPal but ultimately it is fraud and would be down to the police to deal with such occurances.
CaptainJack
| 
