I have made a thin ply blade shipper. It has 3 piece of luan, a back, a holder with a 10.25 hole to hold the blade glued to the back and a cover screwed to the previous..
I have hash marks to realign the cover and I have always gotten it back. It has multiple return address labels and a warning that a saw blade exists.
I use those really thin foam sheets .. the closed cell type on both sides of the blade for added protection.
Because when getting it sharpened the same can happen in shipping.
I enclose it in a self made cardboard box.. probably not necessary..