I don't think there was any doubt, but archaeologists like to show solid physical evidence, of which they had not had any yet, probably mostly because leather d

I don't think there was any doubt, but archaeologists like to show solid physical evidence, of which they had not had any yet, probably mostly because leather decays so quickly. Similar to how it's hard to know exactly how material culture evolved before the stone age because much of the technology and tools have decayed. We have a good idea, and a few examples, but the more we can collect and understand the better we can paint the picture of history.