FIG. 1 is a bottom plan view of a back cover for a handset showing my new design;

FIG. 2 is a right side view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a perspective front view thereof;

FIG. 6 is a bottom plan view of a back cover for a handset in FIGS. 1-5 showing my new design in an environment of a handset;

FIG. 7 is a right side view thereof;

FIG. 8 is a front view thereof;

FIG. 9 is a left side view thereof; and,

FIG. 10 is a perspective front view thereof.

The broken line showing of the remainder of the handset in FIGS. 6-10 is for illustrative purposes only and forms no part of the claimed design.