The magical scale armor appropriated by Sir Listeneise was forged using some of the last mithril ore mined in Acanthras. The Lost Claw of Pontanok was recovered from the hoard of the infamous dragon Hroddzegor Gildenfang. The Orb of Winter's Wasting was instrumental in the successful early career of Glatisant, the Witch of Baubles.
Permanent magical items of level 10 or below may certainly have a bit of history attached to them, but those of higher level almost always do. With that in mind, when you write your character descriptions and background, please remember to include just a word or two about where your level 11 and higher permanent magical items come from, and/or how you acquired them.