This could well be the case, and certainly the seller should be responding to your messages. But in my experience USPS is very inconsistent at keeping shipping status up to date. Like "the lobster," I have actually received packages whose shipping status still indicated nothing more than that the label had been printed. Since estimated delivery on the wheelset is 9/26-10/2, if it's delivered on Monday or Tuesday it's still within the estimated time frame. If it doesn't show up by Tuesday and there's been no update on shipping status, then I think maybe I'd start making more of a fuss.