Just looking at these pictures, I do not think it is bone.
I think it is worked stone though. I would look for a university with a decent archaeology department and write to someone there. For example the University of Pennsylvania is supposed to have an excellent department (anthropology).
Look at their list of faculty and write to someone such as this person
. Don't send the photos at first, because the university email system might dump it, but write asking if you can send the photos.