Follow the Rules when creating/calculating the item.
As long as you do that, you can explain and rationalize the item however you want. Be it a family heirloom, a scavenged Staff from some sorcerer or your very personal wand made from the tooth of that dragon you killed... If it fits your game, go for it.
My thoughts exactly.
And if the user doesn't have Item Slots to spend, then someone else had to "bankroll" the item with one of their own item slots, with an extra shift to allow it being loaned out.
Or... the user spends a Fate Point to temporarily have the power (which is the item) for a scene.
