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. The internal features which are shown in broken lines are for illustrative purposes and form no part of the claimed design.