He better make copies.....Customs could consider the papers stolen goods and seize them upon arrival.
I am sure that digital copies have been made and sent to us servers for safe keeping. Corsi is shrewd, give him that. Besides, they could have been sent via FedEx as he got off the plan so he didn’t have to carry them and before the word got out that he had them. Remember, only Corsi and his aide new they had them at the time they left so they were not racing a clock.
He should make copies and ship them to several trusted associates, such as his attorney, etc.