I have the same exact issue in my E90, coming from the passenger side and mostly when it's cold outside, going over bumps or potholes. I tried the same diagnosis and can't find any obvious free play in any of the suspension components. I even removed my swaybar and did a quick test drive yet the noise is still there.
Struts are the likely culprit, either an issue with the mount or the strut internals. Have you ever changed them before?
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