I will uncover an even more terrible secret.

If the box has a different design, then it still has a display addressed to the buyer. If it "broke", then I will just refuse to buy. "I blindly" no one ever enters a PIN code.

The POS terminal is able to break not only the payment, but also the refund of the payment made on it before the closure of the shift. To return, you need your card and your check number (at least we have in the store). Although I suspect that now owners of terminals will rush here, whose return, oh-oh, unfortunately, is not supported.