How to make a traditional oblong origami box

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1st picture of traditional oblong origami box

01.

Let us start with the back side of the paper facing up.

Prepare to valley-fold the paper in half vertically and then unfold.

2nd picture of traditional oblong origami box

02.

Valley-fold in half vertically according to the step #1 and then unfold.

Prepare to apply a vertical "gate-fold" and then unfold.