Hello Terry, and welcome to the forum.
Those are such exciting finds! Thank you for sharing. It’s always amazing to find history in the ground and be able to preserve/share it with others. Of course there is the curiosity around the story behind them (who dropped the musket ball?, were they in a hurry?, what did they do next?) that makes it fun to think about.
I’m not exactly sure about the cufflink shaped item either – based on the corrosion pattern it does appear to have a piece missing that was once in the middle.
Great finds! I hope you get a chance to explore/find more