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?