USPS scam ?

The scanners they have fit in the palm of your hand all they have to do is walk past you. I don't bank online, no debit cards, no social media,accounts. All I use my computer for is a email ever so often and look up car stuff.
In a stack of a handfull of cards i doubt they can capture one card. If you use tap and are too close with wallet it wont read it.