We have dealt with our fair share of fraud as well and the only real way to avoid it is to call and verify the person yourself. This will also help you market yourself and ensure to the client that your door is always open for them just in case they ever needed anything.
Also, traffic analyzers work like a charm, half the time I see a suspicious order, I log in to see when they entered their order and notice that a foreign IP was on the exact same page before a US IP would log on to the exact web card ID.
Hopefully these tips help.
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