This happened post 9/11. Anything at 10k or over had to be reported. It was the government's way of locking down funded terrorism in this country. Because determined terrorist would think of depositing $9999 a day every day for as long as it took, right?
Our government is just ridiculous. And if $9999 is the threshold for terrorism why is $600 the threshold for asset hiding? I would think we'd catch more sooner if they would check to see if money was being deposited into offshore accounts aka tax havens.