There have been pilgrimages traveling this road for many eons, and so it's entirely possible that things would have been dropped -- old plates, traveling gear, and yes, also old tech. It will almost certainly be sand-blasted and may possibly be the new home of a bug or two, but if Reze can work with that and fix it, she's welcome to stumble across portable speakers!

Alternatively, yes, there are definitely portable speakers from the library that Wayfarers can borrow, so you can handwave that someone else borrowed them, then lost them, and Reze can find them.