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Yup, I went to a small museum in Kenya (near the Olduvai Gorge in Tanzania) and they had piles of hand axes/cores from the surrounding area that teams found on surveys while looking for fossil remains on the deflated/eroded surfaces. There had to be thousands of them piled up.
Even if the population was very small, the number of tools that can accumulate over a million years is incredible. A stable population of 100 people using 10 tools per person per year for a million years is a billion tools. (And the population capacity of what is now Kenya had to be more than 100 people.)
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