Does USPS have a tracking number?

Related questions

1. Can you track Amazon delivery driver?
2. How long will it take for my package to arrive USPS?
3. How do I track a certified letter through USPS?
4. How do I track my Amazon package in real time?
5. Can you mail medication through USPS?
6. Can you track certified mail by address?
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8. Is Amazon going to put UPS out of business?
9. Does tracking cost extra USPS?
10. Will Amazon keep using USPS?

Tags

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2. #about
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4. #basic
5. #tracking
6. #insurance
7. #confirmation
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14. #although
15. #services
16. #included
17. #proof
18. #delivery