No shadows on reflective materials from Unity baked GI?

Hi we're looking at baking a room and have some reflective chrome assets using the Unity Standard Shader but these assets don't receive shadows or any AO unless we reduce the reflective amount which seems wrong to me? Surely fully reflective opaque materials still receive shadows when in the dark? Unity appears to be treating them as if they are emissive?

• Further thoughts, I get the idea that reflection is light bounce but still reflective surfaces shouldn't be treated as a whole. We have done some tests where we put an externally baked lightmap into the Occlusion slot and get the desired results. Is there a way to force the Enlighten engine to use the Occlusion slot instead for its light maps?