This is a lost artifact, known only through ancient stories of long-deceased ancestors, and has not been discovered in Ur.
Apart from a sprinkling of shiny element dust gathered in the corners, it would be easy to discount it as a particularly well structured old pigskin trash-bag, apart from the a) the sturdy handle, b) that would be a waste of a good piggy and c) no one piggy would be enough for this bag, which is large enough when closed to hold a 1200-page manuscript, or possibly an infant.
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