CUI Cover Sheets
 
Is a CUI cover sheet mandatory?

CUI materials hand-carried out of the office or approved telework location will be placed in an opaque envelope with a CUI cover sheet (SF 901) on top of the documents.  In addition, the cover sheet can be used to protect the document from unauthorized access and observation at any time, but it is not a requirement if the documents are at your desk or in your office. 

If using a cover sheet, you must use the official form (SF 901), with one exception.  The Privacy Act cover sheet can be used in place of the CUI cover sheet when protecting documents containing Privacy Act information.