Scenario: A person has a CoinBase account with 100 Bitcoins and wishes to leave the country with $250,000. This person has chosen to download his bitcoin to a w

Scenario: A person has a CoinBase account with 100 Bitcoins and wishes to leave the country with $250,000. This person has chosen to download his bitcoin to a wallet that has no historical transaction history with CoinBase save for a fresh download the DAY AFTER he arrive in a new country... How is the US Customs going to know where the physical location of that money is or went?