An anti-theft system for an automatic teller machine (ATM) causes a currency alarm pack to deface the currency supply in the event that an attempt is made to transport the entire ATM. When the machine is moved, a localized field is momentarily activated and thereafter deactivated and disabled for a first predetermined interval. A triggerable currency alarm in the money supply of the machine, includes a field detector and a motion detector. The currency alarm is triggered when the following three conditions concur. First, the field detector detects the localized field and thereafter ceases to detect the localized field. Second, the motion detector detects motion of the currency alarm during a predetermined delay interval less than the first predetermined interval during which the field is disabled. Third, the field detector does not reacquire the localized field during the predetermined delay interval. Thus the currency alarm operates not only when an attempt is made to remove the currency supply from the machine, but also when an attempt is made to move the machine itself.