Some of the fold are difficult to photograph and explain so I tried to show multiple angles. There are also photo comments that may be helpful.
If you're successful in making this box, please post the picture in the comments below, yay!
-fold a cross into the paper then unfold
-fold an x into the paper then unfold
-fold the corners into the middle then unfold
-fold each corner to meet the fold opposite it that was made in the last step then unfold
-bring in the v-shape as shown in the first two pictures
-fold the flap and part of the v-shape away to help keep it together
-continue the same steps on the other sides until you get the shape in the last two pictures
-fold the left side of the flap to meet what was part of the v-shape from earlier
-fold the flaps back and forth a few times to help the box keep its shape
Done! To close the box simply put one flap down at a time and tuck the last on over, just like you would a cardboard box.