Shadow anomoly

Here is a very strange artifact. This is Pro version. I have a point light above in the scene and the waste basket object is a solid piece of geometry. No holes in it. Note the hole in the shadow behind it. It seems to be the open mouth of the waste basket somehow letting light through. I have double checked the geometry and normals in 3DMax and re-exported. Any ideas as to why this is happening? How to fix it? Thanks ....