"Unspoiled" in this case would most certainly mean the uruks were to refrain from eating the prisoners, including cutting limbs off of still living prisoners to keep the rest of the meat fresh.
In addition to unspoiled simply not being used in English to refer to spoils of war or plunder, I'd point out that orcs and ostensibly uruks have no material culture, and thus would not value the jewelry or possessions of prisoners, although they obviously value combat equipment such as armor and swords (eg Frodos mithril shirt)
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