Working in back loops sl st in first 2 sts, ch 14, dc in fourth ch from hook and all following ch, sl st to next back st, sl st in next st *, ch 12, repeat between *, ch 16, repeat between *, ch 15, repeat between *, ch 17, repeat between *, ch 19, repeat between *, ch 18, repeat between *, ch 16, repeat between *, ch 14, repeat between *, ch 18, repeat between *, ch 15, repeat between *, finish off.
With wrong sides tog join to turning ch of last row of front, sc in each st across front, sc in each st around sides and bottom working through both loops of both pieces working one extra sc in each bottom corner, sc around top of back, sl st to finishing sc, finish off.
Insert fries between front and back pieces, sew through all three layers. ((Fries worked in back sts are taller and should be against back of box.)) Sew several or all back fries to back of box. Sew several of the taller front fries to the back fries loosely.
With red join to back, 2 sts to the right of center, ch 5, sl st to the second st to the left of center, finish off.