The ornamental design for a shelfpanel, as shown and described.
FIG. 1 is a top perspective view of the shelf panel;
FIG. 2 is a bottom perspective view of the shelf panel; and,
FIG. 3 is an enlarged side view of the shelf panel.
The shelf panel is shown broken away at one end to show indeterminate
length, it being understood that the opposite end is a mirror image
thereof and that the contours repeat uniformly along its length.