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system
how to send money across borders physically and inexpensively, but not via cash?
user
i assume the same criteria apply for this as your previous question. you want to physically transfer in excess of 50,000 usd multiple times a week and you want the transportation mechanism to be instant or very quick. i don't believe there is any option that won't raise serious red flags with the government entities you cross the boundaries of. even a cheque, which a person in the comments of op's question suggests, wouldn't be sufficient due to government regulation requiring banks to put holds on such large amounts.
assistant