light leakage in scene

[reberts2]

I am challenged with light leakage (I believe it to be) in a scene with packages on a sweep.
The light seems to be leaking where the objects touch the sweep = cannot get shadows.
Attempted several variations in environment and light settings with no resolution.
3 tube lights in scene, sweep material is mix of 2 glossy materials,
products have gloss material (reference attached).

Thoughts, thanks in advance?
-Rick