MarcusIII
Emperor Mongoose
The section where they kept all the jewels other valuable item like Fabergé eggs, jewel encrusted boxes and the like was very near a direct exit door at the lower level onto the Rue De Louvre. At least that's where they were the last time I went there. Not an optimum place for them.In the French cases, it's clear that somebody got into the security system and procedures, studied them, disabled what they could and used timing for the rest.