Thanks for your comments Jordan, Terry and Dave. I'm now almost certain the two screws and plates are spring tabs that the door 'ramps' on when closing to depress the switch plunger (as in Dave's sketch).
As to the remaining blackout provisions, each door window, the upper right side window above the spare tire and on the sliding windows that separate the body from the cab each have a rolled up vinyl cover and dome fasteners to keep them in place when down. The generator cabinet doesn't have a blackout switch. It has that sliding, insulated steel panel that would keep the light inside when the outer doors are open...providing the crew remembers to close it before opening the outers.
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