Steel or brass cases?
If steel cases, just gather up some and set them out where outside air can get to them, then inspect the inside of the case.
Those box labels have already lied to you once. There's no such thing as "ball ammo made to hunting specifications" in my opinion. Any ball ammo shouldn't be used for hunting. Nothing of any size anyway.
I think the part where is says "Made To Hunting Specifications" is there to allow it to be imported into the US.
