The one thing which does make my orders stand out is that I always request registered mail with a signature required at this end, but this is because of parcels going 'missing' over here rather than something at their end.
What makes RF Parts so special? If I was going to carry out a credit card fraud I would be purchasing large quantities of iPods, not four PA transistors and some PTFE coax.
I have considerable experience in ecommerce. Crooks never ask for a signature and they almost always place huge orders. My favorite attempt was the Nigerian who wanted 10 bridesmaid dresses (we don't sell them) shipped next day air to Lagos for the wedding of a 'prince.' Lately I'm seeing more fraud attempts originating in Latin America and they're tending to be less ham-handed, if you excuse the expression.
Yes, small orders, say under $100, are very low risk. But one could say the same about owner occupied home loans. Until recently. Do you really think ham suppliers are gold mines nowadays?