Do you really believe that?

Having worked with, and in in some cases US Embassies and Consulates I can tell you that it is unlikely unless that office has a Treasury or CBP detachment (some do). A duty officer at a smaller station might make things more complicated than needed. Depends on which one would be used. But this is not really the thread for the uselessness of US foreign offices so I digress.

As others have noted, make sure to check on filing requirements for where you are leaving. The UK, EU, and many other locations have an exit filing rule ~10,000$US equivalent also.

Artlover, he will certainly be asked questions and there is no way to predict what kind of agents one will get on any given day. There is a CBP agent who posts in TS/S "Firebug" IIRC who can provide more insight I presume.

You will always be asked at least three questions, the source of the cash (his savings, or loan, or gambling winnings, inheritance, etc), where you got it (straight from bank, holding company, family etc) and what generically you will be using it for (US deposit, purchasing, etc).
You want to have the receipts/logs showing how the money was either given to you or saved at home. THe more paperwork the better normally.

People bring in and leave with large amounts of cash daily so it is not unheard of but the larger the amount the more time it could take depending on agents and even the demeanor of the bearer.

You can give advanced notice to Treasury via the links I posted earlier and that is often wise.

I personally have seen them take forever to clear 12K and not even bat an eye at 151k$ in a big metal suitcase. With DHS it always depends.