Regarding my earlier question about a mounting plate that is too
large, the holes that are for mounting the light to the plate line up
directly with the mounting holes in the box. I wonder if I could just
mount the light directly to the box using these holes. The light is
designed to have the plate mounted separately to the box using two
screws and then the light to the plate using two more. The light is
fairly heavy but by no means the heaviest available.

Thanks for earlier responses and in advance for this.