Here, results show that volumetric additions of CoCp*2 to colloidal dispersions of Sn:In2O3 NCs indeed causes a systematic blue-shift of the LSPR, while also retaining the colloidal stability of the NCs. With an increase in NC size or Sn doping percentage, we observed a progressive decrease in the maximum LSPR shift achieved, which is in excellent correlation with the observations previously made for Sn:In2O3 NC films. Notably, the magnitude of maximum LSPR shift achievable through chemical doping is significantly higher than that achieved in films or even with solution phase electrochemical doping, for NCs of similar size and Sn doping percentage. Through a recently developed Drude fitting model that accounts for depletion, we demonstrate that electron transfer from CoCp*2 to NCs during chemical titration results in a decrease in the volume fraction of the depletion region. The plasmonic core of the NC expands and the concentration of electrons in that core region increases. We rationalize the trends in the maximum achievable LSPR shift across a range of NC diameters and doping concentrations by analyzing changes in the depletion region volume fraction and using quantitative analysis, we track the changes in the electron density throughout the chemical reduction process.