musketball?

I found these Sunday and can't figure out the bullet, similar to a Picket, but not the caliber. Next, my dad has a Musket rifle and believes this squashed item could be a fired Musket ball, but he's not sure. Does anyone have any ideas? Thank you.

This was yesterdays, I was excited to find the Enfield. I found this other bullet, I don't believe I'm very familiar with it. Then I found this squashed thing lol. My dad has a musket rifle and he said it made him think of a fired musket ball. He didn't want to say for sure. If anyone has ideas...