Nobody said American Natives didn't have a concept of ownership. However, with American Natives, and many other tribal Natives around the world, it isn't "yours" or "mine" it's "ours" and in any tribal society people share all resources, tools and everything else, they don't collect things only for themselves which will only get used once in a while by only them. Except in the case of clothing, jewellery and other personal things, anything that could be used by everyone is used by everyone. In many cases, even shelter is shared. If you and I are in a tribe, if I have an axe, we have an axe. If you have a shovel, we have a shovel.
Im just a guy with a bunch of native placer platinum nuggets, with no jewelers licence, or anything of that nature. So how do I sell these natural platinum nuggets ?