The Pima County Sheriff’s Department said the notes contained distinctive patterns in their wording, syntax and phrasing that someone familiar with the writer might recognize. The Pima County Sheriff’s Department has not said whether it believes the notes are authentic. Savannah Guthrie appears to believe the notes are real as she said in a social media post on Saturday: "Someone suspects something. But it is not clear whether these are the same two messages later released by the sheriff’s department. The Pima County Sheriff’s Department referred to the notes’ "writer" in the singular and said the communications showed an evolution in tone over time.