We're currently abroad and since we can't send packages by fedex or UPS to a PO Box we decided to fedex our I-751 application to a friend in the US who will then mail it for us. Can someone tell us what the recommended method is for our friend to send our I-751 application? Registered, certified, priority, overnight etc.... We're sending it to the VSC (address below). Thanks for any help.
USCIS Vermont Service Center
75 Lower Welden Street
P.O. Box 200
St. Albans, VT 05479-0001
USCIS Vermont Service Center
75 Lower Welden Street
P.O. Box 200
St. Albans, VT 05479-0001