Shipping something home, especially before a particularly treacherous leg of a journey, makes sense as a precaution.
It's a ridiculously high-magic world, so the shipping could simply be a spell. (The writers ain't shy about using magic as the solution to practically every problem in their plot.) Some wandering magical good-deed-doer could handle the process, or that silly "author" plot, even.
Personally, from what was shown, I figure it could just as easily be a common design that she recognized rather than necessarily the same object. Presumably, she'd consider such a clue that she was on the right track.
They have yet to elaborate on that part, though, which I suspect means they have yet to decide any of this.