Should I ask the supplier for their ability to print box design and put "Made in China" and the FNSKU on the box?

Should I get my FNSKU designed into my box?

Yes you can, but this might cost you more depending on the design. This might offset the label application cost with your supplier however, so be sure to chat with them about the best option. 

Remember also, you need to have the FNSKU with black ink on a white background. You cannot have black on brown cardboard. 

We also might recommend a sticker vs getting it printed on the box as this is easier in some cases (like with the 20 unit challenge!)