I am not entirely sure the part you are referring to, but the cover is referred to as the photocell shield. This part is shown on the third page of the instructions. The purpose of the photocell shield is to help control the sensitivity of the photocell sensor. In other words, the shield helps control the amount of light it lets in to the sensor.
Here is a copy of the instructions: http://www.e-conolight.com/pdf/Instructions/CI269X01.pdf
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Date published: 2017-02-23