There's a film by a fierce Putin and Kremlin critic, Andrei Nekrasov, which is titled: The Magnitsky Act - Behind the Scenes
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Apparently, it started off as a drama of the Magnitsky story. But while researching, Andrei Nekrasov discovered that the Western narrative had "serious flaws", and Andrei ultimately came to the belief that Magnitsky was not the whistleblower he has been presented as in Western media.
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Andrei calls Browder's narrative inventive, and filled with prejudice. He also says that he has not found any evidence that Magnitsky ever accused police of stealing money.
https://youtu.be/zud5rLCmmWQ
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I haven't watched his film, but given Western MSM's record of being wrong in geopolitical news, and particularly concerning Russia, I'm not just going to believe what they say in the case of Magnitsky - especially when someone with a history of opposing Russia's gov't, who's comprehensively investigated the story / read the documents in their original language, says otherwise.