shell casings

Hey, guys, hoping one of you can help a newbie out! I picked up an artillery casing at a military surplus store and I just want to know a little more about it. A lot of the identification markings are rubbed out but there is an indentation in the center indicating it has been fired. It stands...

Here's what turned up today. Nine 30.06 rifle cartridges (seven in the holder and two were loose), 1 single .22 cal round (fired), two .357 cal bullets (fired), three intact .45 cal bullets (fired) and two "slightly distorted" .45 cal bullets. The object on the left is a mystery. It indicated a...