He will also receive a final reward, the Jaw Bone Knife. By heading there, Arthur will witness the dinosaur skeleton recreated in all its glory. The letter is an invitation to her current location, which is close to Cumberland Forest near Valentine. Once all thirty locations have been revealed, you have to let 24 in-game hours pass, head over to any post office again to receive Deborah's letter. To do so, you simply need to head over any post office and interact with the clerk at the counter to send a letter to Deborah with the location. Simply finding the dinosaur bones is not enough to complete the mission, as Arthur has to mail the location of all the bones to Deborah. The mission can be initiated at any time after Chapter 2, but can only be completed fully after the story has also been finished, as the final 8 bones are located in New Austin, which cannot be accessed in any way before the end of the game. By interacting with her, Arthur will learn of the dinosaur bones scattered all over the world and of the woman's request, which is to help her locate 30 of them. She can be found in The Heartlands in New Hanover, a little to the south of the 'H' in Heartlands on the map. The 'A Test of Faith' mission begins when Arthur meets Deborah MacGuiness, an amateur Paleontologist.
