I don't know if the color of the cases is random, but this is what I have. And they all have locks.
Bachelor Party - blue
Beat em and Eat em - brown
Custer's Revenge - red
Bachelor Party/Gigolo - blue
Beat em and Eat em/Lady in Waiting - brown
Burning Desire/Bachelorette Party - blue
Jungle Fever/Knight on the Town - blue
Philly Flasher/Cathouse Blues - blue