I have used TechMark for decades for sharpening.
I have worked with Jill but I'm not sure if she's still there.
Many years ago I shipped my blades to them in the original styrofoam boxes with an outer cardboard box.
As the blades get sharpened over time they get a little smaller each time and they don't fit snug in the styrofoam anymore.
The blades can now rattle around in the shipping process.
Then one time I got the blades back and the tip of one of the blades was sticking about 1/4" out of the box.

The chopper blade was chopping out of the styrofoam.

Apparently, thank goodness, nobody was injured but it could have been bad.
I ordered the special wood boxes from TechMark and always used them since then.
As Wally mentioned, you can make your own wood holder until you get the box from TechMark.