Q&A for How to Make an Origami Box with Printer Paper

There are loose corners on the inside of the figure from where you folded the outer edges in. The bottom of those edges that are in the middle are folded into triangles.

On each side of the triangle, you should have two layers, a top layer and a bottom layer. This step means that you fold the left top layer to the center crease and the right top layer to the center crease.

No, you don't need square paper. You can use regular rectangular printer paper when folding this box.

Make another identical box, but use a slightly larger sheet of paper so that it will cover the box.

Keep the top-to-bottom fold from step 1 when you make the left-to-right fold from step 2. Then, after making the crease in step 2, unfold the left-to-right fold so you only have the fold from step 1. Take one of the folded corners and tuck it inside to get the shape you see in step 3.