September 20, 2011 > Shaved keys sought by US Post Office Shaved keys sought by US Post Office Submitted By Officer Kim Macdonald, Fremont PD The US Postal Inspection Service recently sent out a flier regarding reproduced keys used to open US Postal mailboxes. Many of these types of mailboxes are located in apartment and rental communities to act as a "master key" and open many of the mailboxes. Anyone finding this type of key is asked to take possession of it and contact the US Postal Service. Possessing this type of key or a reproduced key is a felony under the US Code.