
Cintra Bristol |
Pathfinder Maps, Starfinder Society Subscriber; Pathfinder Roleplaying Game Superscriber

In the first three chapters, there are about 20+ creatures from the original Bestiary, almost 20 from Bestiary 2, and about 4-6 from each of Bestiaries 3, 4, 5, and 6. So the first two Bestiary boxes would be my recommendation.