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Hm. Here's the page from the Federal Register, Volume 72, Number 51, that Photoman referenced. It's an Acrobat PDF file: http://ribbs.usps.gov/FILES/FEDREG/USPS2007/E7-4803.PDF.

SUMMARY: The U.S. Postal Service is
amending the rules for conduct on
Postal Service property to clarify the
prohibition of carrying or storing on
Postal Service property any firearms or
other dangerous weapons, or deadly
weapons or explosives, except for
official purposes.

DATES: Effective March 16, 2007.

FOR FURTHER INFORMATION CONTACT:
Lawrence Katz, Inspector in Charge,
Office of Counsel, U.S. Postal Inspection
Service, 202–268–7732.

SUPPLEMENTARY INFORMATION: The
amendment to the prohibition of
carrying, either openly or concealed, or
storing any firearms, other dangerous or
deadly weapons or explosives on Postal
Service property is to clarify the rule,
ensuring that these items are only
possessed for official purposes. This
change would eliminate potential
conflicts with other laws, rules or
regulations which may allow the
possession of these articles for other
than official purposes.