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#13 - Dumb - you are showing your card numbers all the time you wallet is open.
I do keep an eye on my Mastercard account. But if I will ever see some unknown transaction, I am 110% sure that the cause will be some Internet store leaking my card number, not because someone at the grocery store peeked over my shoulder when I opened my wallet.
Retroactively trying to fix something takes WAY more time and effort than a common sense, passively-preventative attitude. Trust me on that, I am /very/ lazy.