I bought a Nitori Karabo about three years ago and used it as a baby closet, with one shallow box on the top. As my child has grown, I bought a shallow box and a deep box to use as a toy rack. I thought I would install it myself, but I wanted to use four shallow boxes and one deep box, but I just couldn't get the shelves in... When I tried to put the shelves in, the bottom of the box kept hitting the box, so I thought that maybe the box was not compatible with the shelves, and I was at a loss. When my husband checked, he said that if you don't use the shelf supports and just use the screws that came with the box, you can put the shelves in. I was able to install them successfully. I'm sure there are people who will be in the same situation, so I'm writing about it here.