Ford manufacturing plants have seen some considerable activity the past few days, and not the productive kind. Two heists took place this week, the first resulting in at least four S550 Ford Mustang Shelby GT500 muscle cars getting stolen from the Flat Rock Assembly plant early Thursday morning. The second resulted in $1 million worth of Ford F-150 Raptors stolen from Rouge Assembly Complex grounds in Dearborn, Michigan. Ford Mustang Shelby GT500 And F-150 Raptor: Heist DetailsAccording to Mlive, Flat Rock Police notified the Detroit Regional Communications Center at around 3:20 AM that four o…