Cigerette lighter case

Here is a cigarette lighter case I found next to a Wyoming lake. It is my first unique find. I found it but it was not a signal that I would have choose to dig but I dug it anyway. From what I know it is copper with a blackhills gold insignia on it. For all you out there, it was found with my whites dfx metal detector. Like I said, I found it on bank of lake because lakes have been to high here in Wyoming because there was 190% snow pack in mountains. It was burried about 4 inches down. The ground was soft and wet but not hard where someone dropping something would leave it for the next person coming along.