FIG. 1 is a front perspective view of a rear cover for a handset showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The broken line showing of the remainder of the handset is directed to environment, is for illustrative purposes only, and forms no part of the claimed design.