The Paris prosecutors" office on Wednesday, Jun 10 have started probing into the theft of the 11 million dollars worth book that even boar the painter's name. The sketchbook was kept in a special glass case that could only be opened using specific tools, the French culture ministry's website said.
A museum employee found that the notebook was missing on Tuesday, Jun 9 morning. The museum is closed on Tuesdays, and the police say that the theft could have taken place either on Monday, Jun 8 or on Tuesday, Jun 9.
There was no surveillance in the room, said a police official anonymously, who have been directed to not discuss the case in public.
The culture ministry's statement revealed that the book which was red with the word 'Album' inscribed in gold on the front, dated from 1917 to 1924.