You do not indicate why you can't wire the money into your account overseas or why taking certified funds is not acceptable. You have to be very careful with that sum of cash for many reasons including theft, the IRS and federal law enforcement. There must be another way. Good luck
The advice I have given does not bind the parties in any manner and is merely given as a courtesy.
Just make sure you fill out the form in both directions. One client of mine declared $25K coming in but did not declare $15K going out, thinking he had already "declared the money".
There will not be an investigation at the airport.
I agree with my colleague that traveling with cash like that is more than risky.
The above is general legal and business analysis. It is not "legal advice" but analysis, and different lawyers may analyse this matter differently, especially if there are additional facts not reflected in the question. I am not your attorney until retained by a written retainer agreement signed by both of us. I am only licensed in California. See also avvo.com terms and conditions item 9, incorporated as if it was reprinted here.
As a former prosecutor and former judge, I can tell you that traveling with that much cash will have you profiled by law enforcement and stalked by criminals. We have travelers checks, credit cards, and other forms of ready access to money rather than carrying cash
The information provided in this answer does not create an attorney-client relationship and is not considered to be legal advice.