(b)
The Postal Service may issue an order directing that mail, covered by subsection (a) of this section, be forwarded to a dead letter office as fictitious matter, or be returned to the sender when—
(1) the party claiming the mail fails to furnish proof of his identity and right to receive the mail; or
(2) the Postal Service determines that the mail is addressed to a fictitious, false, or assumed name, title, or address.