If I were interested in growing potatoes in a box, and I am not, but if I were, I'd use more seed pieces. Probably in multiple layers as I filled the box. Possibly even transplanting seed pieces that had a head start in pots. Maybe even topped off with some pull sprouts.
Isn't the idea is to get a box full of potatoes, not how many potatoes one seed piece can produce?
On topic: I start my potatoes in a trench and hill as much as I can to prevent greening.
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