Computer mouse topcase

FIG. 1 is a perspective view of a computer mouse topcase showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right elevational view thereof;

FIG. 4 is a left elevational view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a rear elevational view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken line showing of a mouse is included for the purpose of illustrating environment and forms no part of the claimed design.