Otis Miller and the Arabian Prince
The first one is in the cottage, in the dresser by the bed.
Otis Miller and the Lady with the black heart
The second is in the hut with the corpses. The comic can be found on the nightstand, near which there is a rocking chair.
Otis Miller and the boy from new York
The third comic can be found on the teacher's Desk in a school that stands in an abandoned village.
Heroes of the Wild West No. 132
The fourth is in the green house, lying on the nightstand next to the bed.