Can I use any box to ship USPS?

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Tags

1. #boxes
2. #postal
3. #store
4. #black
5. #retail
6. #thick
7. #remember
8. #order
9. #other
10. #purchased
11. #information
12. #shipping
13. #marker
14. #priority
15. #markings
16. #regular
17. #barcodes
18. #obliterate
19. #companies