The ornamental design for a coveredbasket, as shown and described.
FIG. 1 is a front view of a covered basket showing my new design;
FIG. 2 is a rear view on a reduced scale;
FIG. 3 is a side perspective view on the same scale as FIG. 1, the opposite
side being substantially the same in appearance except for the omission
of the element clasped by the paw; and