It took until 2017(15 years) to find the probable source of SARS, so the lack of them finding it isn't telling of much.
Quote:
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After a detective hunt across China, researchers chasing the origin of the deadly SARS virus have finally found their smoking gun. In a remote cave in Yunnan province, virologists have identified a single population of horseshoe bats that harbours virus strains with all the genetic building blocks of the one that jumped to humans in 2002, killing almost 800 people around the world.
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https://www.nature.com/articles/d41586-017-07766-9