Today I read a news article about scammers targeting Nordstrom computers in South Florida. Scammers distract the Nordstrom employees and take apart the register/computer back panel and add a credit card skimmer.
Thankfully these bad guys were caught because of surveillance camera footage. But, as a consumer you wouldn't even be able to be on the look out for this kind of skimmer because it is hidden. So make sure you pay close attention to those credit card and debit card statements.