@Kyorin
DEFINITELY get a crime number from the police. Even if they don't do anything, it will help your case with eBay. I had similar - was sent a (tracked, signed-for) postcard from China instead of the electronic item that I ordered. eBay/Paypal sorted the problem out without hassle.
eBay will send you instructions about what to do, just follow them and let the process do its stuff.
Biting the hand that feeds IT
