Here are a couple of examples that *could* be considered hyperbole, but are more likely just colorful language:
* "He could hear the rumble of the trains, the shouts of the people on the street, the beat of the drums in the bar across the street." This line uses exaggeration to illustrate the intensity of the sounds Lemon Brown hears. It's possible this is an exaggeration, but it's more likely just a way of showing how keenly he is aware of his surroundings.
* "His face was like a mask of leather, and his eyes were like chips of blue ice." This line uses similes to describe Lemon Brown's appearance. The comparisons are exaggerated, but they serve to create a vivid image of a tough, weathered man.
Overall, "The Treasure of Lemon Brown" relies more on other figures of speech, like similes, metaphors, and personification, to create vivid imagery and emotional impact.