ST. LUCIE COUNTY, Fla. (CBS12) — The St. Lucie County Sheriff's Office is warning residents to remain vigilant following a highly sophisticated "gold courier" scam that nearly cost an elderly resident her entire life savings. According to authorities, quick action by the victim ultimately prevented a massive $414,000 financial loss. The sheriff's office told CBS12 News on Tuesday that the scheme relies heavily on emotional manipulation, "grooming," and asset liquidation.