A box is far more than 5 cubic inches.
We don't know precise measurements, but from SS in boxing videos I've seen, it looks like it's in the range of 4x4x3, which is nearly 50 inches cubed.
The Sport box is a little smaller, but we're still taking about figures that are far higher than 5.
Doh. I meant 5X5X5 inches. 5 per side.
If the dimensions are 4X4X3. That would be 848,000 boxes on a 777F and 2.34 million on a 747-400F.