Sounds like a very complicated high tech operation. The parts that should clue the victims into believing it’s a scam is when someone calls them impersonating a relative. The victim should either not recognize the voice as that of the relative or notice an obvious accent. The same applies to someone going to their home to collect the money, that person will appear to be quite un-American.
> The victim should either not recognize the voice as that of the relative or notice an obvious accent. <
The scammer is just rolling dice here. He hopes that if he makes enough calls, eventually his voice will at least somewhat match that of a relative.
Evidently, it works often enough.
Side point: I’ve read that some of the more sophisticated scammers troll social sites like Facebook to record voices. If they can get a big enough sample, they feed it into a computer program. That program then generates whole sentences, whatever the scammer wants to say.