How to make a narrow deep origami box

(page 6)

9th picture of narrow deep origami paper box

09.

Apply two valley-folds of the step #8 only on the front-most layer.

Prepare to unfold two valley-folds that you have just applied.

You should go back to the state of the step #8.

10th picture of narrow deep origami paper box

10.

Unfold two valley-folds that you have just applied at the step #9.

Prepare to apply two valley-folds only on the front-most layer.