You can take whatever you want in and out of the country, 50,000, no problem. It's not illegal. Give me a break.
It's only an offense to fail to declare it. BIG DIFFERENCE from the interpretation above.
By the way, that declaration is made to DHS (Customs, or whatever they call themselves now) and no one else.
It's not the police's or the airline business. Certainly not some night watchman or chump with a tin foil badge's business..