From PostalReporter reader:

OPM updated their “Summary of Benefits Checklist Upon the Death of a Federal Employee” that agencies, like USPS, are supposed to use.  The PDF file is posted at http://www.opm.gov/retire/pubs/bals/2009/09-102attachment2.pdf.  This would be a useful reference for those people planning for or facing this situation.  Who knows how helpful HRSSC would be?