I read the book(s) long time ago and I don't have them with me now (sorry if some details are vague), but as I recall, Shaftoe gets addicted to morphine as a consequence of the treatment of his war wounds. Enoch Roots helps him to heal and to stop the addiction using the content of a box he has, that for Shaftoe is much much better than morphine (I think he says that regular morphine is to the content of that box like a prostitute would be to his beloved girlfriend, or something like that, meaning incredibly good).
Root is sitting on the opposite bunk with the cigar box on his lap. He holds up his hand in a V for Victory, then levels it at Shaftoe's face and pokes him in the eyes. "I cannot help you with your inability to find physical comfort-it is a problem of body chemistry," he says. "It poses interesting theological questions. It reminds us that all the pleasures of the world are an illusion projected into our souls by our bodies."
A lot of the other speaking tubes have ruptured now, and screaming comes from most of them; Root has to lean close in order to shout into Bobby's ear. Shaftoe takes advantage of it to reach over and make a grab for the cigar box, which contains the stuff he wants: not morphine. Something better than morphine. Morphine is to the stuff in the cigar box what a Shanghai prostitute is to Glory.
Chapter 58, Conspiracy
By the end of the novel another character gets badly hurt, and again Enoch Root is able to miracleously save the day with the content of that box. The healed character refuses to explain about the content of that box or the healing procedure / method with the other characters.
Amy's leg gets infected and the doctor comes this close to sawing it off to save her life. Enoch Root spends some time alone with her and suddenly her leg gets a lot better. He explains that he applied a local folk remedy, but Amy refuses to say anything about it.
Chapter 102, Liquidity
I think that the box is described as a regular cigars box.
What is the content of Enoch Root's box?