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can i ship my USPS flat rate box with UPS?

i have traded in some movies and need to ship them. I have printed out a prepaid shipping label. I have some flat rate boxes and was wondering if i could ship it with UPS. Please Help!

Public Comments

1. I would say yes, just mark out the logos and words on the box. Im pretty sure UPS wont care.
2. It's a felony to do that. It's considered defrauding the USPS. Since the USPS is a governmental agency, it would be a federal offense.