In the case of Nancy Guthrie's disappearance, the FBI has made a determination about some of the ransom notes received. These notes have been found to be extortion attempts that lack legitimacy.

This finding suggests that not all ransom demands are being taken seriously by investigators. However, it is also acknowledged that some ransom demands may be legitimate.

Further details about the case and the FBI's investigation can be found through FOX 4 News, the source of this information.