There were differences in Neanderthal and Homo Sapien behavior. For one thing, Neanderthals appeared not to travel or trade very much. For their tools, all the materials they used were obtained from a few yards around the caves they lived in. With Homo Sapiens from the same time period, the stones on their spears and knives was often taken from 20 or 50 miles away, because it was superior to the job. Clearly the result of trading with other Sapien tribes.
So we know that trading among Neanderthals was limited at best. They appear not to be terribly sociable at all.