If you’re missing SF50(s) and are a current NPS Employee, try to access your eOPF via Bison Connect. Otherwise, contact Bob Harshaw at robert_harshaw@nps.gov or 303-985-6865. If you’re missing SF50(s) and are a former NPS Employee, send an email request to: lmwfa_sf50_request@nps.gov . Include your name, the last four digits of your social security number, and a USPS mailing address to receive the documents. Do not include your date of birth or your full social security number.