Independent test results show there are no toxins in the air at the Greenwood Main Post Office.
On Monday the building was closed after several employees complained they felt sick.
Doctors say 9 workers who sought medical attention do not have a serious illness, or need to be hospitalized.
The National Guard took their own air samples and send them to SLED labs for analysis.
Those results have not come back yet.
The Magnolia Avenue office will handle pickup and deliveries until postal leaders get the final test results and cleanup is complete.
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