Editado por Bryan Weary: 12/9/2019 7:14:30 PMIt would have needed to be in your inventory(not equiped) after the Warmind update that brough in collections. You can still get that one at random though, so maybe that can give you a bit of hope. Edit - Not sure if that one would return a shader to you. If it was pre-patch, it may not. Up to you if you take the chance.
You need to own the shader post-collections for it to be added to your collections. I 'think' dismantling items will give you the shader back. Might want to verify with a random item that has a shader to check first, though.