In the case of Nancy Guthrie's disappearance, the FBI has made a determination about some of the ransom notes received. According to officials, certain notes are considered extortion attempts without any legitimate basis.

These findings suggest that not all ransom demands are being taken seriously by investigators. However, the FBI also notes that other ransom demands may be legitimate, indicating that the situation is still being closely examined.

For more information on the Nancy Guthrie case and the FBI's investigation, readers can refer to the original report from FOX 4 News Dallas-Fort Worth.