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Most of them use a magnetic reed switch to trigger the alarm. Should be trivial to use a throwaway magnet to keep the alarm from going off.
Or, just use them while not stealing anything. Have fun evacuating the whole store (leading to lots in lost profits) because, “Oops, I didn’t read the sign”.
Meh, usually they’re not hooked up to the building alarm system, and just make a noise on their own. They expect it to just draw attention to the area, and if the fire alarm needs to be pulled, someone will do that.