Since I am having dash rattle issues (as it gets colder here in Canada), I wouldn't be surprised if they heard a rattle on a test drive before you bought it and attempted a fix. As of today, I believe there is a TSB out for the HUD rattles (but might not yet be a solution, but at least Honda acknowledges it), but I haven't seen anything for the Sport without HUD like mine, which has two rattles, one on each side.
But just guessing.
But just guessing.