In the case of Nancy Guthrie's disappearance, the FBI has made a determination about some of the ransom notes received. Officials have found that certain notes are not legitimate and are instead extortion attempts.

These extortion attempts have been identified as lacking legitimacy, according to the FBI. However, it is also possible that other ransom demands may be genuine.

Further information on the case and the FBI's investigation can be found through FOX 4 KDFW in Dallas-Fort Worth.