TUCSON, Ariz. — The Pima County Sheriff's Department released a pair of ransom notes Friday in the hope that someone can identify the author due to similarities between them that indicate they were written by the same person, who authorities said used a "unique linguistic style." Authorities have not yet confirmed that the notes are authentic, but Guthrie's daughter, "Today" co-host Savannah Guthrie , has said she believes they may be — and investigators haven't ruled them out either. GOT A TIP? They were sent on Feb. 2 and Feb. 6. NEW DETAILS FROM NANCY GUTHRIE RANSOM DEMAND REVEALED, 'HER LIFE IS IN YOUR HANDS': REPORT According to the sheriff's department, the two notes share a "unique linguistic style" and are believed to have been sent by the same person. The style is so distinct, that someone may be able to recognize the writer, authorities said. The notes included references to the crime scene that may not have been public a...