Analyzing My "Accident"

The more I think about this, it just doesn't make sense.  That damage is obviously a poke like would have been caused by the corner of my bumper but there is no damage or even a mark on the corner of my bumper.  I only have a 3-4" light scratch a good 6" away from the corner and toward the center of my bumper (shown in first photo of my rear bumper).  I honestly don't think I caused the damage at all.  I wish my insurance company would see it my way but it is what it is and, as far as I know, the report is closed because there was no damage to my car.  I'm sure it will stay on my driving record, though.