I haven't researched that, but to my understanding, you don't need an extra copy of the weapon itself. Just the weapon and... Orihalcum or whatever it was?
I'm not sure was Ixid Blade one of the weapons you can do that to, though. I think starting from the SECOND second reprint on, those became a thing. So starting from Phoenix Bow.

Again, don't take my word for it. This is so far away I haven't researched the topic in the slightest.