I really, really like this book by Tomoko Fusè. As far as I know, it hasn’t been translated. The ISBN is 9784416307052. Square boxes page 84, rectangular page 88.

The box on the left is folded from 2 sheets of “back to basics” paper by Dovecraft, theme “baby steps”, 20cm (the paper is 150 gsm cardstock, thin enough to fold but makes strong boxes!). The middle is chiyogami 14cm, the rightmost is “Die Sachenmacher” 20cm. Step 6 of the box, I recommend leaving a 1-2 mm gap to make step 19 easier and cleaner.

The box on the left is folded from the same Dovecraft paper as the one on the above photo. The one on the right is japanese yuzen chiyogami 15cm.