Er, what makes you think the senders address on the parcel was the correct address? After all, inside the package being sent is illegal counterfeit goods......
You had a responsibility to check for the correct return address before you sent anything back. I would be suprised if the watch you sent back "blind" is found....
Whenever I send a watch back, I always confirm the address, even if I have an address from a previous correspondence in my inbox. At the end of the day, I look at it as if I am sending "MY" property back, at least it is until it is safe in the dealers hands....
Good luck