Whenever I see reports about these skimmers, I always wonder how in the hell someone managed to install that thing into the pump without anyone seeing them do i

Whenever I see reports about these skimmers, I always wonder how in the hell someone managed to install that thing into the pump without anyone seeing them do it. Every gas station that I've ever been to has had a direct line of sight from the cashier to the pumps, presumably in case of fire so they can hit the shutoff as quickly as possible. Maybe a non-24 hour station and passersby just assumed it was maintenance? But do they not have security cameras?