Well the picture is not as good as seeing it in person of course but I still think it's for a tea set. Tea cups placed in with opening down and stacked, then tea pot on top... tea pot's are not that heavy especially if made from "clay". it does not look like you would have a boiling kettle in there though.
Although I could concede that it might also be a display box for some "bottle/urn"
Lambert can you describe the inlay, is it just one solid shape or are there ridges?
I am going to e-mail the first picture to my wife and ask her if she can read it.