Which ancient civilization invented the first known receipt system using clay tokens sealed in clay envelopes as proof of transaction?

Before modern retail systems, ancient civilizations developed sophisticated methods for commerce and trade management. These early 'point of sale' systems helped merchants track inventory, manage transactions, and build commercial empires. Test your knowledge about how these ancient retail pioneers handled their business operations thousands of years ago!

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Mesopotamian (Sumerian) merchants around 3500 BCE
Egyptian traders during the Old Kingdom (2700-2200 BCE)
Phoenician marketplace vendors around 1200 BCE
Chinese Han Dynasty merchants (202 BCE-220 CE)