I just checked two boxes from an '01 base and one from an '02 S. They all had an 01 date stamp and were part number: 996.618.262.01.
My guess is that your original module had water damage and was replaced with a new one from the factory. If the Immobilizer unit is replaced, the DME has to be re-programmed for it, or both replaced as a set along with the key.
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