I hope I'm wrong, but it may very well happen. That's what happened to the buddy of mine -- unfortunately, the piston kit went to Australia... otherwise the person would probably end up getting a knock on their front door. So now my buddy is out a few hundred dollars; expensive lesson. His brother had a similar situation happen, except the parcel was insured. The f'd up thing about is that the customer asked to have the customs declaration dollar amount lowered so that he wouldn't have to pay so much VAT. Now the brother is only going to get back what he declared on the customs forms.
Sorry to hear about it, Jamie... I don't think there is that much you can do, unless you know someone in their area. If the person is seen riding around with your pipe on (then again, they could have gotten a replacement), it's quite possible you got scammed.