2003 Rock Shox Rear SID

I just bought a 2003 Giant NRS 3, which has a Rear Rock Shox SID.
After cleaning it after it's first ride, I noticed a O-Ring at the
bottom of the shock. Is this oring just sit outside of the shock, or
is something broken?? I tried to access Rock Shox web page, but it
really has no info for the 2003 models (Web Page is down). Any
answers would be appreciated

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