Most stores have video. The shooter was very security concious. I wonder if he scoped the store out for cameras before he asked about the body armor and ammunition.
If the FBI were really intent in these cases, they could have asked for phone information from nearby towers to find out who was calling at the time he was in the store.
if its in jensen beach florida-lotus gunworks 3558 NW Federal Hwy
Jensen Beach, FL 34957 go to google maps i couldnt see outside cameras but if you walk inside they have a monitor showing 8 cameras to the side of entrance. they also have a monitor when you walk in the front door showing those that walk in and a couple of parking places in front.