May I suggest that it's the perfect-seeming flatness of the metal that looks odd; I think that's it; there is something.....it looks industrially-made; real flat, no hammer marks, which wouldn't make sense; I think it was just a real precise metal bending job; maybe the corners were made with a "brake", as in N American sheetmetal work; a type of bending vice/jig, instead of hammering. I don't know if PI traditionally uses such a tool though (I'm sure they do now).
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