There are 7 total screws holding on the top.

1 screw is under where the camera is labelled a7iii. It is the silver one on the right as opposed to the black one on the left in a similar position.

2 screws are behind where the EVF was, partially hidden by the pad when in place. They are silver even though they look black in the photos.

1 screw is in the top-right facing back under where the exposure adjustment knob is. Silver.

1 screw is in the battery compartment. Black.

2 screws are under where the rubber hand-hold was.