The ornamental design for an paintbrushstoragecase, as substantially shown and described.
FIG. 1 is an isometric view of the paintbrush storage case;
FIG. 2 is front view of paintbrush storage case shown in FIG. 1;
FIG. 3 is a back view of the paintbrush storage case shown in FIG. 1;
FIG. 4 is a top view of the invention shown in FIG. 1;
FIG. 5 is a bottom view of the invention shown in FIG. 1;
FIG. 6 is an end view of the invention shown in FIG. 1, the opposite side constituting a mirror image;
FIG. 7 is an isometric view of the paintbrush storage case in the open configuration and showing the interior of the case and the inside of the cover; and,
FIG. 8 is a top plan view of the invention shown in FIG. 7.