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https://www.usps.com/help/refunds.htm
If you canceled your order after it was accepted at the Post Office, request a refund by calling 1-877-747-6249. When prompted, select Option 3 for Small Business. Have …
https://faq.usps.com/s/article/Delayed-Mail-and-Packages
The volume of mail fluctuates daily, therefore, delivery times are not guaranteed. All deliveries should be made by 5:00 p.m. local time Monday through Saturday (unless there are unusual circumstances …
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