Fraud- Capodimonte museum, Naples

The phone rang. I had just returned from a week in Naples and Sorrento.
"Have you spent 700 euros on books in the Capodimonte museum in Naples?"
"Pardon?"
"And 500 euros in an Italian supermarket?"
Well, I had just been congratulating myself that despite all the horror tales of crime etc in Naples I had returned without being robbed or mugged. Now this. I had reckoneed without the new crime of credit card cloning.
So how did it happen? Well, the most likely suspect is the museum itself since I had bought some books - a mere 30 euros - there on the day of the first illegal transaction and had lunch in the museum cafe- that's when the waiter took my credit card away for rather a long time.....