Do you know how different the XAVT box is from the XXL box? It must be pretty close I would think. You might have a better chance at finding one of those?
I may be wrong but I think the new knives have been shipped without the case for a while now. Old stock with the case is still around though I think. I’m just going by unboxing videos I’ve seen lately. I’m thinking the cases will only get harder to find.
This is an extra that I have but I’m not selling it. Sorry.
I just wanted to share my idea.

