Mystery solved. The whole assembly was shattered revealing an inner mounting bracket.
The screws I am seeing are actually the screws that hold the mounting bracket to the mirror assembly. The 'screws' everyone is referencing are those that hold the mounting bracket to the gusset.
The screws that hold the mirror assembly to the mounting bracket are traditional, pointed screws. The screws that hold the bracket to the gusset are machine screws with Phillips heads that are more bolt than screw.
Anyhow two of those were covered up by the inside door panel.
Thanks to all.