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The first Object makes it look like Aliens invented Cricket. Seriously. What these items show us is that there are somethings we may never understand. All of the witnesses have gone, and the only means at our disposal can be supposition or conjecture. There can be enough information to be intriguing without providing sufficient information to complete the picture.We need to examine how they can change our preconceptions,. Rather than worry about what cannot be true of the objects, we should concentrate on what is true about them, or they will just create new Myths. There is the Sherlock theory of eliminating the impossible, but sometimes the definition of impossible can depend on an individual.

Carbon dating is carbon dating. If the items in questions have been dated by several labs with the same results, what's the mystery?
The mystery is that intelligent humans (or humans at all) did not exist that long ago. Or did they?