Article continues below advertisementWhoever sent the ransom notes demanding millions of dollars in Bitcoin for Nancy Guthrie's return has been unreliable from the start, according to an ex-FBI agent.Appearing on the Monday, April 20, episode of "Brian Entin Investigates," retired special agent Steve Moore remarked: "They would provide no proof of life. They didn't take Nancy's safety into consideration, according to physical evidence at the scene.""Everything they did was in bad faith. So it's like negotiating with Iran," he continued.