The note can be found at the makeshift vault, inside of the vault itself. After entering through the vault door, it is immediately to the left, on a wooden desk.
Since construction on our own vault is ahead of schedule we decided to head into Grafton for a final supply run.
Saw a bear sniffing around when we got back. Managed to scare it off with the rifle though. I don't think he'll be coming back any time soon.
Things are starting to get bad out there but we should be finished in a couple weeks. We'll be alright.