I've started reading a book called So Much Stuff by Chip Colwell, and it begins with an analysis of creatures around the world using tools, either opportunistic or crafted, and then into the wide range of humanoid ancestors over the last seven million years and their stone cutting tools. He has references and notes and citations, and from where I am in chapter one I can project that he will soon be talking about modern era archaeology and our looking back at what our ancestors chose to carry around and keep. (I think I bought this via Bookfinder.com, and though Amazon owns Bookfinder, you can still find new and used books much cheaper there because they have charity shop listings and such.)