As far as donating to the museum, I have a little experience with this. As most have suggested, I probably wouldn't do that. They're right, it probably would never get displayed and nobody except research archaeologists would ever see it. I think you should take some detailed photos of it and contact the New York State Archaeologist. Let them know what you found and send the pictures to them. I would keep it in a display case by itself. If they ask you to donate it ( they probably will), just politely decline and tell them that they are welcome to come to you if they wish to examine it. Just my opinion but I think I would keep it instead of it going to a drawer in a back room of a museum. It's up to you of course, but I would make the archaeological community aware of it but would retain ownership. Also, it's safe to give them a detailed location of the find, they may want to survey the area to find out if there is a significant site there, but it will be kept confidential..they don't want someone digging up the site and destroying it. Good luck with whatever you decide to do, just thought I'd offer my opinion..and again, fantastic find! Good luck on your next hunt!