My Notes label got removed and all the notes I had in gmail (synced to Notes app in iphone and Mac) disappeared.. they're still there, they just are almost impossible to find.
Looking at the message signature the only defining feature I can see is that they are from me and have no recipient.. I would love to filter for those, but can't figure out a way to search for an empty field.
I tried from:me to:() and some things like that but no luck