USPS Priortity mail boxes reusable?

RedFish said

It cost us more money for the post office to have the boxes printed on the inside. They had no choice since some were inverting the box and using it at other shippers..

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EXPLAIN TO ME why using a box which I or someone else ALREADY PAID FOR is any business of the USPS?

If the box is reusable, it is far more "green" than so called "recycling"

If I'm NOT shipping USPS, or NOT using priority mail, I need a box, do I not? Are these boxes not already paid for?

This would be the same thing as if Folger's coffee told me I cannot use a coffee can for a nut bucket!!!!