Hello,
No opinion on the finds, just a little tidbit that helps when you have found something questionable. Take your strongest magnifying glass and examine the surfaces of the article; compare this to known tools, many grinding tools have thousands of tiny scratches and foreign matter embedded, cutting tools show chipping and sometimes grinding for sharpening/re-sharpening; a handle area where human hands have held a tool often develops a "patina" from the oils in the hand of the user, darkening and smoothing the surface of the handle.
Some tools were "tools of convenience" an antler point or bone could be used as a planting dibble then discarded for example, likewise a sharp stick; for working leather (quite a process to make leather by hand) a round, smooth stone might be used to work grease into the hide and then discarded etc. Hammer stones used to crack hard nuts or bones (to get the nutritious marrow) were another type of tool of convenience, use perhaps once or perhaps many times then discarded. With this type of 'tool of convenience' it is difficult to make absolute statements unless there is a lot of evidence of use (as in the tiny scratches, foreign matter etc).
Oroblanco