I've had this happn to me ...
a few times. Fortunately, my credit card companies also contacted me when they saw activity that was not the "Norm" for my credit card history. I'm guessing that because credit fraud is so widespread these days that they have developed a profile of our credit card history that allows them to recognize the fraud when it happens outside the "Norm" of our personal activity. In any case, CC Fraud is here to stay, so card users beware!