Final answer:
Copper is found in some of the plastics used for computer cases, notably as copper (II) nitrate which enhances certain properties of the plastic.
Step-by-step explanation:
The material found in some of the plastics used for computer cases is copper. It is one of the additives that may be compounded with plastics to confer certain properties.
While computer components can contain a variety of materials for conductivity, heat dissipation, and durability, copper (often in the form of copper (II) nitrate) stands out as being noteworthy for its use in some plastic components.