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Rickochet Always use this when any package is on the 4th day. I have done it several times. It's like a postal worker's laxative...gets their asses in gear!!! And works every time, usually next day delivered or at least found. You should hear something back within a few hours.
https://www.usps.com/help/missing-mail.htm
And just an FYI for the future.....NEVER ship anything USPS during December. Live.....learn.....