Has someone ever sold you something which has turned out to be a scam, especially on the internet? This is now sadly very common as the internet seems to be attracting a lot of the worst types of unscrupulous people. You can try and find out who the person was, they probably used a false name, but even so there are methods. Obviously start with a simple search engine search, this can be an easy way to locate them or their place of business even when they try to hide, but if the person is an internet expert they may have their online anonymity watertight. For such situations where the person is more skilled at hiding you need more detailed background checks or Free Reverse Lookup Websites which can help you locate them using the one or two pieces of information you do have..