No; the brass plug is to retain the spring and plunger for one of the selector rods.
The black disc, is where the filler cap used to be on the earlier boxes, such as the S1.
The bung on the side is the filler/level plug I think.
When I did my S3 axles and boxes, I noticed none of the published quantities in the manual seemed to match what actually got poured into them,
Cheers Charlie


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