I'm going to step back from this, realize i'm getting in too deep and arguing with a 19 year old, who found it when he was 13 and his brother 11.
I'll wait for the pictures of the actual stash of goods in the cave, not individual pieces. I think you'll find as you grow in treasure hunting, that no matter how remote, how undisturbed the land seems, there has been many, many people through there. Ask any treasure hunter on here who hunts in the most remote spots of the US, put a coil to the ground and you'll find bullet casings, lead bullets, shot gun shells and iron scrap.
Waiting anxiously for the pictures.