The oxidation state of Cu and Fe in copper pyrites is respectively:

${\mathrm{CuFeS}}_2$ exists as dimer ${\mathrm{Cu}}_2{\mathrm{Fe}}_2{\mathrm{S}}_4$

$\Rightarrow {\mathrm{Cu}}_2\mathrm{S}+\underset{\mathrm{FeS}+{\mathrm{FeS}}_2}{\underbrace{{\mathrm{Fe}}_2{\mathrm{S}}_3}}$

Hence, O.S. of $\mathrm{Cu}=+ 1$, $\mathrm{Fe}= +2$ (in both $\mathrm{FeS}$ and ${\mathrm{FeS}}_2$ )