I believe I left my helmet on the rocks at the base of the guide cracks on the side of Daff Dome in Tuolumne on Saturday August 26th, 2017. If you found it I'd like to get it back. Please PM me. It's a Grey/Orange Black Diamond Half Dome Helmet with a Mountain Project sticker on top, a Patagonia Piton sticker on side and a Metalmark sticker on the other side.
I don't have your helmet, but someone walked off with my Tuolumne Meadows Supertopo the same day from the same spot. I was at the Guide Cracks/Alimony Crack from roughly 2-4 PM; if anyone who was there ends up with an extra one let me know.