Nancy Guthrie's disappearance has taken a new turn with anonymous tips suggesting she's buried in Mexico. A volunteer group is investigating, but authorities remain skeptical, citing a lack of evidence linking her to the area or cartel activity. Retired FBI agent Maureen O'Connell questions the tips' credibility, emphasizing the need for verifiable origins. The search for the 84-year-old, who was taken from her Arizona home, continues.