FIG. 1 is a perspective view of an exit device centercase cover embodying our design;
FIG. 2 is a right side elevation view thereof;
FIG. 3 is a left side elevation view thereof;
FIG. 4 is a front elevation view thereof; and,
FIG. 5 is a top plan view thereof.
The broken line showing is included for the purpose of illustrating and forms no part of the claimed design.