Most robberies like that are inside jobs.
Deeper investigation into possible connections between the robbers and the guy in the silver car should be conducted.
I think you have this one right. Years ago I was in a small country store when a blond ran in screaming"someones on your roof with an ax, I think he's trying to get in" When no one moved she said to the clerk"aren't you going to do anything?"
Clerk said "I am doing something" as she locked the register and pulled out her .357.
Blond ran outside and jumped a in waiting car.
