If he used a bump key, would my key then not work? I am wondering if he does come in when I am not here, could I tell from the lock?

Answer (1 of 2): If a bump key is used correctly it does exactly what hand picking or using a picking gun does, only faster and less skill involved. It simulates what your keys does by creating the correct combination of cylinder and housing pins to create a “shear line” this allows the cylinder

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