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Detail of the outer surface of the closure.

Picture 8 of 11.

Another view of the desiccant opening cover.

The part number molded into it is "RX-20633-203". I was unable to find this exact part number, but the "-201" variant of this part number is a "Cover, Preservation and packaging," which seems to also describe this cover's purpose.

Note the humidity indicator on the closure below and on the left side of the cover.