a lug box having cored - out plastic end walls and a wrapper , preferably of corrugated paperboard , that is nailed to the end walls . the wrapper is formed by a single piece including bottom and side panels as well as foldably attached lid flaps that provide a top for the box . each end wall has parallel ribs extending along its bottom and side edges that receive the nails . reinforcing ribs in the center sections of the end walls lend added rigidity and strength .