FIG. 1 shows a perspective front view of a first embodiment for a design for a portable electronic device case.

FIG. 2 shows a perspective back view of the first embodiment.

FIG. 3 shows a front view of the first embodiment.

FIG. 4 shows a back view of the first embodiment.

FIG. 5 shows a left side view of the first embodiment.

FIG. 6 shows a right side view of the first embodiment.

FIG. 7 shows a top side view of the first embodiment.

FIG. 8 shows a bottom side view of the first embodiment.

FIG. 9 shows a perspective front view of a second embodiment for a design for a portable electronic device case, where upper and lower case portions are separated.

FIG. 10 shows a perspective back view of the second embodiment, where upper and lower case portions are separated.

FIG. 11 shows a front view of the second embodiment, where upper and lower case portions are separated.

FIG. 12 shows a back view of the second embodiment, where upper and lower case portions are separated.

FIG. 13 shows a left side view of the second embodiment, where upper and lower case portions are separated; and,

FIG. 14 shows a right side view of the second embodiment, where upper and lower case portions are separated.

The broken lines immediately adjacent the shaded surfaces represent boundaries of the claimed design. All other broken lines are directed to environment. The broken lines and unshaded regions within the broken lines form no part of the claimed design.