The ornamental design for a cosmeticsbox, as shown and described.
FIG. 1 is a perspective view of a cosmetics box;
FIG. 2 is a front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is a perspective view thereof, wherein the cosmetics box is in an opened position with internal container trays in an extended position for illustrative purpose.