Which retail innovation did ancient Egyptian merchants pioneer around 2000 BCE that served as an early form of product branding and authentication?

Before modern shopping malls and e-commerce, ancient civilizations created sophisticated retail systems that would influence commerce for millennia. From Mesopotamian market stalls to Roman shopping complexes, innovative retail concepts emerged that we still see echoes of today. This trivia explores a fascinating retail innovation from ancient Egypt that revolutionized how products were presented and authenticated to consumers - an early example of brand identity and consumer protection in the ancient world.

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Cylinder seals stamped on clay tags to mark authentic goods from specific merchants
Papyrus receipts with hieroglyphic money-back guarantees for dissatisfied customers
Colored ribbon systems indicating different product quality grades in marketplace stalls
Limestone loyalty tablets that customers could collect for discounts on future purchases