The ornamental design for a cover for a surface mount control box, as shown and described.
FIG. 1 is a perspective view of a cover for a surface mount control box of the present invention.
FIG. 2 is a perspective view of the cover for a surface mount control box of FIG. 1, with the cover in the closed position;
FIG. 3 is a top view of the cover for a surface mount control box of FIG. 1, with the cover in the closed position;
FIG. 4 is a top view of the cover for a surface mount control box of FIG. 1;
FIG. 5 is a left side view of the cover for a surface mount control box of FIG. 1;
FIG. 6 is a right side view of the cover for a surface mount control box of FIG. 1;
FIG. 7 is a front view of the cover for a surface mount control box of FIG. 1; and,
FIG. 8 is a front view of the cover for a surface mount control box of FIG. 1, with the cover in the closed position.
The broken line showing of structural features is included for the purpose of illustrating non-claimed subject matter and forms no part of the claimed design.