As reported by the USPS Delaware office, there have been some delays in package delivery recently. In particular, packages from their distribution warehouse to our Delaware warehouse are delivered late or at least the next day, while the system already shows the status "Delivered" at the USPS warehouse itself.
Because of this, it gives the impression that the parcels have been delivered to our warehouse, when in reality this is not the case.
According to USPS, the problem should be fixed in the near future.