This section is from the book "Box Furniture", by Louise Brigham. Also available from Amazon: Box Furniture.

Body. 1 Stuffed-olive Box (about 103/4 in. deep, 71/2 in. square).
Corner Trim. 4 Strips 3/8 in. thick, 1 in. wide, 21/2 in. longer than height of the box. 4 Strips 3/8 in. thick, 13/8 in. wide, 21/2 in. longer than height of the box.
False Bottom. 1 Piece 1/2 in. thick, 4 in. larger than the box each way.
Remove the cover from the box. Make the corner trim 21/2 inches longer than the height of the box. Proceed as in Illustration No. 9 until ready to put the corner trim in place. Each corner trim should project 21/2 inches above the top of the box.
 
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