I can relate, well not really, but I have a cool story so bear with me. About 3 years ago I bought a 100,000V Stun gun off US Ebay as you do. Just over 2 years after having it and performing many practical jokes on mates, I get a phone call out of the blue, from the local plod asking me to bring it down to the cop shop. At first I play dumb, as you do seeing how could they possibly know after 2 years, but the copper explains to me that the federal police wanted them to just get a warrant and just search my house instead. Once I bring it down the police station, they show me all the details of my original purchase (Ebay auction number, my username, price, seller etc.). It did leave me wondering though whether they caught on straight away and sat back and watched whether I bought anything else dodgy or if they are snowed under. Ohh well, I exchanged my stun gun for an official receipt saying they now have it in there possession.