If you are the buyer: Purchase postal money orders if you don't have paypal. Make copies of the money order stub, and the shipping label, itemize what is in the envelope as payment for goods and list the goods. Also keep all records of coraspondance albeit it mail or telephone, dates times etc.. Use overnight or second day, or at least some type of registered mail. If a postal money order is cashed and goods are not recieved, you can file a claim with the post office. The post office has federal agents that carry guns that will bust thiefs, and have full arrest authority, and they will even do stakeouts and pose as mailmen when delivering packages once someone is under investigation!

Here are the procedures for filing complaints. First and foremost file a complaint with your local PD, that has juristiction in your area you live. Take copies of the above mentioned items. Second call the PD where the package was sent to, and file a police report. Also you can go to the Website for the FBI internet fraud investigations. I beleive it is called ice, but i'm not sure. I had varying effects when doing all these things, but it has helped sometimes. Alot of it has to do with the PD"S and policies dealing with internet and fraud.