There are Leek models with S30V and CPM-D2. That's a little bigger than the Scallion (3" vs. 2.25"), but they should hold a usable edge much longer. I have a Chive that uses 420HC. It's a good, fun little knife, but the blade will dull pretty quickly when cutting abrasive stuff like cardboard.
CPM-D2 can hold a good working edge for a long time when breaking down cardboard boxes. I went for about 2 weeks and dozens of large 2-ply cardboard boxes on my CB Leek before I re-sharpened. Even then, it was still slicing paper somewhat smoothly, but it was slowing when cutting through the heavier layered cardboard.
The Needs Work is a great box cutting knife too. Very comfortable handle, especially if you do a lot of continuous cutting. The edge (I have the 14C28N version) doesn't hold out as long as the D2, but it seems like it endures at least as well as my AUS-8 blades.