The use of the phrase "pristine" in the context of the novel shows that the objects that are salvaged are important artifacts that show a stable society that is different from the chaos created by the Omegas.
This refers to the use of hints to give background information about a story for better understanding.
Hence, we can see that from the given text in the novel, there is the use of narration to show the actions of the Omegas as they caused havoc and "swept" one block after another, but there was some salvage done to protect important artifacts that give a semblance of normalcy.
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