Which ancient civilization first used sealed clay tablets as 'trademarks' to guarantee the quality and origin of their traded goods?

Before modern marketing techniques, ancient civilizations had their own sophisticated methods of product branding and retail strategies. From Roman merchant guilds to Egyptian royal seals, product recognition and trust were built through various clever techniques. This poll tests your knowledge about how ancient merchants differentiated their goods in competitive marketplaces thousands of years ago.

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Mesopotamians (circa 3500 BCE)
Ancient Egyptians (circa 3000 BCE)
Indus Valley traders (circa 2500 BCE)
Minoan merchants (circa 2000 BCE)