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Here are two links to posts dealing with how to post pictures on Black River Fossils forums.
1. How to Post Pictures on Black River Fossils Forums by ditchweezil
2. How to Post Pictures on Black River Fossils Forums by Daryl
Yes, a native made clay pot full of artifacts. I don't think I could donate them either. Like you said, the clay pot alone would be an awesome find. I have only found a few pottery shards over the past three or four years myself. It is interesting that you have found most of yours under roots too. I look ,but generaly find nothing under them.