hey gang, a bit of FYI, the USPS has a "Priority Mail Large Flat Rate Board Game Box"...
Inside Dimensions: 23-11/16" x 11-3/4" x 3"
I think a large follower might just fit in it. I had not seen this box before.
The delivering carrier might not be too happy.
When I shipped a bunch of lathe chucks several years ago, I printed up a bunch of *HEAVY* labels on florescent red stickers.
Slapped those on every panel.