On the small circular metal table in the treehouse to the south of the cabins, next to the terminal that controls the "spooky" effects. On the curved counter to the left of the blue cash register, inside the Hardware store. Although there are a number of locations where you can find rabbits in Fallout 76, one of the most reliable ones is the hill behind the Whitespring Service Entrance. On top of one of the two wood barrels, in the long, empty metal hay barn with the metal audience chairs outside; east side of the grounds. On the metal office desk, in the southwest corner of the upper level office, in the brick mansion (one of a pair) in the middle of town. Next to the sleeping bag, front left corner of the tent, adjacent to the three blue barrels just outside the tent entrance. On the small round white metal table, on the deck by the yellow chair, east side of the upper deck, northwest "Trading Post" lodge; access via the double doors, from the interior upstairs hallway (exterior). On the low shelf of the long curved wood book check-out desk, on the lower level of the Library (interior).
The stall has a lighthouse painting and a Raider skull board under its tarp; south of the central elevator column (interior). On the magazine carousel by the fallen stool, at one corner of the shanty stall with the large (living) tree to the right of it (the tree is in the middle between two stalls). On the L-shaped counter in the Intake room, in the center of the Penitentiary (interior). On the rubble-filled diner counter, near the crushed skeleton, inside the restaurant (interior).
Currently playing Fallout 76, Elder Scrolls Online and Warframe. On the circular wood table with the white leather chairs, by a reclining skeleton, in the blue wallpaper lounge; Room 204. On the seat of the outhouse, on the rocks roughly north of the main shack structure. He doesn't appear unless someone triggers him. Confirmed locations, where Graham was seen by me and other people: Charleston Landfill (and all route from my picture).
https://fallout.gamepedia.com/Fallout_76_perk_magazine_locations?oldid=2117162. On the formal, oval-shaped dining table, lit by a ceiling light, in the red-ceiling Housewares (furniture) store, upper level, south side.
On the work surface with drawers, left of the locked safe (1), on the roof of the entrance area, inside the mine (interior). New Gad – The submerged town which lies under Summersville Lake. Inside the church, left side pew third from the front (if facing the cultist totem). On the picnic table, in the covered picnic area south of the lighthouse (exterior). In the second-to-left green outhouse toilet (the middle cluster of three sets of outhouses), southwest area of the grounds, close to the "Apples, Hotdogs" stall.
Behind the wood board, against the northeast wall, right of the hat stand and exit doorway, on the upper balcony eating area (interior). So, there's the Grahm's path in Ash Heap: He spawns on the road near AVR Medical Center, then visits charleston landfill workbench (coming directly to table itself, so it have sense to claim the workbench and go afk near him - Grahm will arrive is some time.
Grahm will spawn randomly on fast travel to the workshop and I found he has a higher rate of spawning if there is a defend event. He spawns in point A, then goes through checkpoints to point B and then despawns (confirmed not confirmed. Vertical, jammed between two cardboard boxes, in the center of the shelves of boxes at the foot of the huge map screen, in the Mission Control room. Just find a place with a few road encounter spawns, and walk between them. On the metal magazine carousel, by the uncomfortable red bench seating, in the waiting room across from the reception desk, near the Helipad elevator, across from the main elevator (interior). At the foot of the outhouse, right of the Weapons Workbench, at the Scout Camp shooting range. In the wastebasket, in the corner of the concrete balcony on the north side of the upper area inside the main building, close to the Supervisor Terminal, by the shelving with the plastic pumpkin (interior).