JS_Harris - 10:04 am on Mar 20, 2010 (gmt 0)
What DO you tell the person you phone?
I've caught several fraudulent callers by asking a surprise question during the phone/order confirmation. Immediately after asking for their street address by phone I ask them to tell me which highway is closest to that location. If they really live there they'll know immediately, if they fumble you'll sense a problem before they can recover and of course you'll have a google map in front of you already so you know the answer.
Be polite but whenever you suspect a problem decline the order or request that payment clears before delivery, it's just good business.