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My guess would be that the storage in a thin metallic packet is the answer to your mystery. Because ketchup is an both oily and sweet it will take on the tastes of it's surroundings (similar to wine or jelly). The stuff you buy in store is in either a glass or plastic container. This means there isn't much taste to acquire from the packing and what is there is a dissimilar taste. Whatsmore, plastics and glasses are translucent so light will be getting into the ketchup and also effecting the flavor whereas the ketchup in packets are not exposed to light or air after packing... only the thin metallic container.
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"The courts that first rode the warhorse of virtual representation into battle on the res judicata front invested their steed with near-magical properties." ~27 F.3d 751
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