I don't know details of the case (and the website didn't give much). But it's not illegal to carry more than 10k or w/e the limit, is...but you have to declare it with the Customs/Border Patrol. This includes paperwork and information about the sources, etc. Then if it checks out you're free to take your money
There is no fee or tax or duty unless you fail to file and declare. The government is not taking his money away unless he's been stupid, relax