Joined: Aug 2010
Posts: 12,689
Likes: 2,094
From: Madison, WI
Bikes: 1961 Ideor, 1966 Perfekt 3 Speed AB Hub, 1994 Bridgestone MB-6, 2006 Airnimal Joey, 2009 Thorn Sherpa, 2013 Thorn Nomad MkII, 2015 VO Pass Hunter, 2017 Lynskey Backroad, 2017 Raleigh Gran Prix, 1980s Bianchi Mixte on a trainer. Others are now gone.
Did he shake the package first to see if it rattles?
If that is a freewheel rear hub, the first chore is to find the correct freewheel remover. You mentioned replacing the headset, but if the only thing that the old one needs is grease, I would keep the old one.