Does USPS deliver packages separately from regular mail?

Related questions

1. Is seller responsible for lost package?
2. Can USPS deliver overnight?
3. What do USPS tracking numbers mean?
4. Is USPS tracking having problems?
5. Can I track a package with a label number?
6. Why would an email be blocked?
7. Is USPS responsible for stolen packages?
8. Can you file a police report for a stolen package?
9. At what time does USPS stop delivering packages?
10. How long should a package be in pre shipment?

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