I have never shipped any live plant, so I can only offer what I read online.
The folks of Fancy Fronds Nursery in Washington, USA sell ferns through the mail. This is what their FAQ says about their shipping:
We only ship via United States Postal
Service Priority Mail to ensure your plants do not spend long in
transit. Delivery typically takes 1-3 days from the ship date
depending on your location. Plants and are removed from their
containers and put into plastic sleeves to help them retain moisture
on their journey and protect their fronds. The root-ball and fronds
are then carefully wrapped in newsprint to cushion them and protect
the fronds from breaking. Plants are packed tightly in a box so they
cannot shift and break during transit. We take great care not to
stack our plants so deep that they get crushed from the weight, which
means you may receive several small to medium sized boxes instead of
one large one. All plants are shipped with their name label which
includes information on plant size, common name, and preferred growing
conditions. We do not bare-root our plants and make every effort to
have them arrive with their fronds intact.
Elsewhere on their site they say that they do not air-mail, and they do not mail during seasons with harsh weather. This all matches the plant shipping advice I see elsewhere, other than not bare-rooting the plants.
I don't know if pruning or waiting for a winter die back will stop it from regrowing. My hunch is no, but if the weather is harsh enough to cause it to die back, I wouldn't want to ship it in that weather anyway.