Notes in Fallout 76 can be found scattered across Appalachia, and can contain scraps of lore, the stories of those who once lived in West Virginia, and various other information.
Transcript for Responder's Note
Hey idiots, want to get into this safe? No problem! We threw the key off the balcony when you were coming up. Saw it land right on top of the*****ter outside!
Pretty sure you walking bricks can't read, so good luck, assholes!
Where to find Responder's Note
At the North Kanawha Lookout Tower, on top of a locked safe.