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Usps 相对比四大国际快递（ups, fedex, dhl, tnt）航班相对少一些，时效相对慢一点，但如果物流已经是提示发往某地，但是物流信息好几天没有更新。原因可能是物流目的地比较偏.
How to Schedule Redelivery with USPS Reschedule Missed Package Pickup
