A shell/cannonball is #8 on my list.
I got to hear a shell once, but I didn't find it. It was neat watching it dug though... you know, watching the nut-case digging it smack it on the nose repetitively with his shovel - as if daring it to finally kill off a couple of rebel-boys 125 years too late ... packing it home, "safely" perched on the truck-seat right behind our heads... then sliding it under Wylie Bill's seat on-the-sly when we realized it might actually blow our heads off... yup, those were good times.
I've made many trips to Charleston and returned without even a single minie ball (or any keeper for that matter). That's the game sometimes. That's your first .69 cal. right? That's something.
Dig-it!