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This is the prop store that I wrote about visiting in one of my set reports, and this picture brings back some fond memories. In the foreground we see some maps—the largest shows the Seven Kingdoms (though in the south it cuts off at the red mountains of Dorne), and just past it seems to be a map focused on the North. Can’t quite make the most distant one.
The horn on a wooden pole appears to be one of the horns on top of the Wall, as seen in the Maester’s Path third puzzle. There also appears to be a book of some sort on the table. If you could go all the way to the end of the prop store, that’s where the various banners were stored when I was there, and where I saw the prototype for the Iron Throne.