Checking for wear patterns would help to determine the usage. Capuchins do not use the flakes, or at least they have not yet been observed to.

Brazilian capuchin monkeys use pebbles as tools for diverse tasks and thus unintentionally create flakes resembling those made by ancient hominins. Capuchins have been using tools in the Serra da Capivara National Park for at least 700 years, and they may have been using tools for more than 100,000 years. Monkeys now flake pebbles near the rockshelters where crude quartzite tools have been cited as evidence of a human presence more than 50,000 years ago. These "tools" may be geofacts created by water and gravity; they may be artifacts made by incredibly conservative pre-Clovis humans; or, they may have been made by the ancestors of today's tool-using monkeys.
http://www.tandfonline.com/doi/abs/1...3.2016.1273000