A fixture I've spent hours restoring is worth nothing if it arrives in pieces, so shipping antique lighting is part of the job here, not an afterthought. Getting a fragile old fixture across the country whole takes as much care in the box as it did on the bench.
The glass is the hard part, and it's what I plan around. Old shades and globes are fragile, irreplaceable, and unforgiving of a rough trip, so they get packed to survive being dropped, because in shipping, things get dropped. That means the shade wrapped and cushioned on its own, the fixture braced so nothing shifts, and enough padding that a hard knock to the outside of the box never reaches the piece inside. I pack assuming the box will be handled badly, because sometimes it is. The fixture itself gets secured so it can't move, because movement is what breaks things in transit. A loose part rattling against glass, an arm free to swing, a socket knocking around, that's how damage happens, and the fix is to immobilize everything before it ships. I've seen how things arrive when they're packed carelessly, and I won't do that to a piece I restored or to the person who bought it. The reviews people leave, the ones that mention things arriving well-packed and whole, that's not luck. It's the extra time in the box, every time. The restoration and the packing are one job, not two.