Restock the shelves with items from only one of the boxes. Store the other boxes in a closet or some other place your child can't access. Then rotate the boxes every few weeks or give some toys to a local charity. Review toys, books and clothing on a regular basis. This will guarantee that items available reflect your child's needs and interests.
Toddlers grow quickly.
Go through your child's closet and drawers. Pack away clothing that no longer fits or give the items away. Keep an empty box near the washer and dryer. As you do the laundry, place outgrown clothing in the box rather than hanging it back in the closet. Donate clothing you won't need again to a local thrift store.