Yet another catalytic converter theft has been reported in Southbury, and police there say they are also investigating an attempted but unsuccessful converter theft from the same location… The Southbury Plaza. The new incidents come just days after a string of catalytic converter thefts took place involving three vehicles within just 24 hours in Southbury. Police say the attempted theft involved a man who was wearing a ski mask who fled the Southbury Plaza in a dark-colored sedan. According to the National Insurance Crime Bureau, Connecticut is one of the leading states in catalytic converter thefts.