Make sure your finish is completely cured before packing into the box. Dry as a bone. No more odor.
A regular box isn’t very fragile, but if you get into more sculptural elements then you need to use much more ingenuity to make sure it arrives in one piece. As with a sculpture you would want to attach it to a base which would be attached to the bottom of your box. That way it cannot jiggle around and break off parts. I have shipped carved hummingbirds mounted on carved bases this way. Finish filling the box with a cushioned filler and then put that box into another box, with filler between the two boxes.
As I said- this is for art-quality sculpted boxes with delicate projections. Our usual 6-sided solid wood boxes are much tougher.
-- "So much wood. . .so little time!" www.woodworks-by-donna.com