Step 1:
(Pre)fold and cut a paper square in half. The paper is about 20x20 centimeters.

Step 6:
This is the other side. Press / fold the edges indicated by the arrows towards each other.

Step 5:
Fold both edges straight upwards over the prefolded lines.

Step 2:
I folded shiny wrapping paper around both rectangles.

Step 4:
Prefold in three parts of the same size.

Step 3:
Prefold in three parts of the same size.

Step 10:
The lid of the box is done....

Step 8:
This is a side view of the model. Fold over these four lines. Make the same folds on the other side.

Step 9:
Pull two of the flaps upwards, see arrows.

Step 7:
This is how the model should look from above.

Step 12:
Fold the four corners inwards, use the prefolded lines as help.

Step 11:
Repeat steps 3 and 4 on the other rectangle for the box itself.
Prefold both edges to the prefolded lines.

Step 13:
Glue the four flaps to the model, see arrows.