Harvey's deal is a paper note in Fallout 76.
Location[]
The note can be found on a bookcase at the Pleasant Valley cabins, only during the quest Seeker of Mysteries.
Transcript[]
Yo! You freaked out about all those 'mysterious assassins' slinking around in the shadows? Afraid your crew is going to be hit next? Your old pal Harvey has just the thing. Missile Launcher to the face! One shot from my little beauty, and all that's left of that girl will be a smokin' crater.
I'm looking for a new gig. Double cut of the loot, and I'm yours. Hit me up if you wanna talk.
Harvey