I will let others answer on the bullets and bullet casings as I don't know enough to give an honest answer. I can help you on the shotshell heads though. Excavated shotshell heads off of paper hulled shotshells are basically valueless (money wise). Very few collectors want just the head. That being said, I have about 5,000 in my collection.
You have some nice, old ones there and at least one that is a rare find. If you would like any date ranges on any of them, or info on them, please let me know.