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TitleCover letter from DLO about enclosed letter and the PM's need to deliver it to the writer
FormNumber3580
Revision 
Division 
WhereUsedPM allowed to open the letter in order to facilitate delivery but cannot divulge contents
EKU1879 ASW
LKU1881 ASW
NotesThis example from Tony W's Exhibit on Dead Letter Office Mail, page 20
SourceSS