UPS ground curled a prop for me that was shipped in a pine box.
They dropped the box and it shot out the end like a spear and curled the tip.
UPS refused to pay because the prop wasn't bolted to the box inside.
Only to say that wood boxes don't guarantee safety. For control surfaces, I'd think a sturdy cardboard box with some rigid foam block end caps to protect the corners would suffice.
Even if they dropped it, they dont weigh enough to come out of the box and the end caps woudl protect them well enough.
If you're doing enough of them, you might even be able to get a bunch of foam blocks made up in advance.