FIG. 1 is a front, top and right side perspective view of a toner storage container showing my new design;

FIG. 2 is a rear, bottom and left side perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a left elevational view thereof; and,

FIG. 8 is a right elevational view thereof.

The broken lines shown in FIGS. 1-8 are for illustrative purposes only and form no part of the claimed design.