Reading All Graffiti in Outbreak

(Thumbnails, click to enlarge)

Firstly, you must do these in order, and you must use the LIGHTER found in the "Drawing room" to see these. First, check the crate closest to the camera from the view you get while climbing the ladder, as shown to the right.
	Second, check that metal sheet just outside the "Store room" on the Rooftop, as shown to the left.
Third, check the rails along the stairs on the "3F to rooftop stairway", as shown to the right.
	The fourth location is in the "Liquor room," by the BLUE HERB past the forklift. See picture to the left.
The final location is on the third floor of the apartment, in the crevice to the right of the elevator. Your character will find a crack in the wall, and...
	You will also get a SPEAR, which normally could only be made by David.