thunder helm

Apparently, I either missed the chest with the Thunder Helm or had my bag full and didn’t notice I’m leaving it behind. Now when I go back to the Yiga Clan and look for the chest, it is not there :(. Is there anything I can do to retrieve the Thunder Helm?

Hi there. I have a weird problem with the helm. I read all over the net that it's lightning proof (no damage at all). I'm confused because when I get struck I still suffer 1,5 heart loss. I've searched everywhere and didn't find anybody with similar problem. So that's why I'm trying here. Is...