Dr. Saatchi didn't have the guts to turn on the surveillance camera. He didn't expect things to turn out like this.
He called the police to investigate Li Du, based on nothing but his observations.
The night before, he saw Li Du poking his head around the entrance of the museum. Then the floor was inexplicably broken. The tables and chairs above fell down. The treasure hunter he hired did not get anything…
Therefore, Saatchi could not help but think that perhaps Li Du, like him, also knew where the masterpiece was!
It was all too much of a coincidence. Li Du just happened to stroll around the museum, the building suffered sudden and inexplicable damage, and then Li Du bid for the room that contained the fallen table and chairs.
Saatchi was a scientist. He did not believe in coincidences.