Not necessarily, it's a crime to deposit 9999 instead of 10 and not report. When I worked at a bank anyone who knew what they were doing and deposited 8-9k in cash got the form. People who found out and then did anything else? You get a form. People who walk out? They get a surprise notice from the fbi later.

Basically if the bank thinks you might be close we just give you the form and you don't get to say no anymore.