Cannes is under the territory of OSA (Office of Special Affairs) France. Their office is attached to the Paris Organization of the "Eglise de Scientologie."
I believe that the most likely persons to know who the fake Peter Alexander really is are;
Bernard Forrestier
Pascal Parizot
Patricia Forrestier
Michel Reveillere,
all part of the OSA gang doing their covert operations on french soil.
I hope this helps track down the thief who stole the film copies from the Cannes Festival.
Love, Michael.