One thing is that I cannot use dreams or visions. I've been using dreams for something else and I'd be afraid they would ignore or not trust it. Another is that I need to get the item from the one character to another. Luckily the one that has it is my character, so I do have some control, but I want it to be in-character, so he's not going to just hand it over without reason.
I've thought about somehow provoking a fight between the two, but there is no guarantee that one will disarm the other. I could have one character literally throw it at the other, but that seems odd (although not ruled out).