I’ve had a fair number of people ask about these Blurb presentation boxes. As you will see, these are fabricated by a company called Process Supplies in London. I purchased three different sizes, have used one so far as you can see by the attached images.
I’m sure there are other outlets for products like this if you are willing to do a little online searching, and I also think it well worth your time to build your own. Customizing books and their packaging is something I’m intrigued by, and also puzzled by how little I see this being done. Kudos to those are who doing it.