Since this thread is discussing nuances regarding carry on postal property, per se., i found an interesting snippet defining employee, per 5 USC 2105 (e), quote:
(e) Except as otherwise provided by law,
an employee of the United States Postal Service or of the Postal Regulatory Commission is deemed not an employee for purposes of this title. Unquote
these kind folk are, by this USC considered "federal employees", quote
(a) For the purpose of this title, “employee”, except as otherwise provided by this section or when specifically modified, means an officer and an individual who is—
(1) appointed in the civil service by one of the following acting in an official capacity—
(A) the President;
(B) a Member or Members of Congress, or the Congress;
(C) a member of a uniformed service;
(D) an individual who is an employee under this section;
(E) the head of a Government controlled corporation; or
(F) an adjutant general designated by the
Secretary concerned under
section 709(c) of title 32;
unquote.
https://www.law.cornell.edu/uscode/text/5/2105#c
so in 18 USC 930 (A)'s definition of federal facilities, [per 40 USCS § 3301 Postal property is in the definition] unequivocally states federal employees are present...
Federal facility
(1) The term “Federal facility” means a building or part thereof owned or leased by the Federal Government, where
Federal employees are regularly present for the purpose of performing their official duties.
yet 5 USC 2015 (e) [cited/quoted above] flat out states PO workers are NOT considered 'FEDERAL EMPLOYEES' by federal law!!
me thinks the four hungry tigers are turning to ghee...