A riddle... lets see who can solve it...

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A bank manager decides to do an insurance company fraud, so he plans to fake a bank robbery.. The bank has a lame design, right next to the front door, there is a huge window, till the corner, and in that corner, there is a safe.. One night, the bank manager goes into the bank from the front door, and starts faking the robbery, he makes a mess all over the place, then he opens the safe, makes a mess from the money, all the floor is covered with dollars.. He goes out of the bank, looks into the bank from the window, and tells himself, nah it doesnt look real, so he picks up a rock, breaks the window, and goes.. The next morning, the insurance company detective comes by, enters the bank, takes a brief look, and says, "this wasnt a real robbery, the bank manager did it". How did he know?