The tiny detail in the Nancy Guthrie ransom note that makes FBI experts think the writers aren’t even in US

The authors of Nancy Guthrie’s ransom note may have exposed themselves as operating outside the US because of one tiny detail in their note – a specification that their multi-million dollar demands be paid out in US dollars, law enforcement experts think.

“Why would you use that if you’re a domestic person? That points to somebody who might be potentially outside the country, which also lends the potential for this being a scam,” former FBI agent Michael Harrigan told The Post.

Savannah Guthrie and her siblings have publicly stated they will pay the ransom for their missing mother Nancy. Savannah Guthrie/ Instagram

“If you’re domestic, why would you ever put ‘USD?’ You put six million,” he added.

Guthrie’s supposed kidnappers demanded a bitcoin ransom to be paid in “USD” by two deadlines – one at 5 p.m. MT Thursday, with the amount increasing for a Monday deadline after the first was missed.

The note sender has made no contact with law enforcement or the Guthrie family since the note was first sent to news outlets last week, and investigators have not determined whether the notes are real or not.