I was wondering if anyone knew of a source to buy between say 1-5 boxes that are approximately the size of the Dungeons & Dragons Starter box? Blank boxes that I can add art to and load up with whatever I like.
E.g. I need one for the set of Songs of Blades & Heroes spiral bound rule books I have, along with the measuring sticks & dice.
I've never actually went out and looked for boxes (though I have gotten messenger bags).
If I want to store books I use file boxes (which can be found at many department stores).
However, if I were to try to find one like you are asking about, I'd probably look in the hobby section of stores or at craft stores and ask if they have any there.
Come to think of it, from the gifts in boxes I've gotten from Amazon...they seem to use boxes that are just about exactly the size which you aer asking. Of course, they all have the Amazon logo on them...but I suppose you could put a cover/paper on them and design it that way.
The downside is that they are like other cardboard boxes, they open at the top instead of having a cover.
PS: Just thought of one other idea. If you go to the stationary section where they have clear plastic boxes that you can store a folder or such in that are thin. About two to three inches thick...not quite the same style as the boxes you are asking about (and plastic), but they might do as well.