"... The poster includes the national toll-free OIG Hotline telephone number, 888-USPS-OIG, for employees and contractors to anonymously — or confidentially — report situations that could compromise the integrity of the Postal Service and the mail. Additional copies of the poster can be obtained at no charge from the Topeka Material Distribution Center (MDC) in Topeka, KS. Refer to General Poster 239...." 
Source: liteblue.usps.gov
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