Originally Posted by PuzzledHeart

You know those mobile banking apps that deposit checks if you just take a photo of them? He could do the same thing with your blank checks. Even if you wrote VOID on them, if he was handy with a computer he could create a mockup pretty easily.

Friends of mine had thousands of dollars stolen from their account when some guy photoshopped their account and routing numbers onto a counterfeit check from a multinational company.

I know this is a PITA, but I would change account numbers if you haven't done so already.