boxes with manufacturer info and the box size on the bottom of the box are just fine to use. They want you to use a box that isn't purchased at USPS and one with no marks or stickers from previous shipments. I buy packs of 25 or 50 boxes on Amazon, the cost ends up being an average of $0.52 per box, and I use each box for up to 5 round trips (to a shipping partner and back), or up to 10 uses shipping it to myself from over 50 miles away from home. I don't do hazmat shops, so I don't worry much about postal zones.
I print out the Amazon invoices, then I scan them to make a .jpg. Each time I build a route I put all of the invoice numbers in a list on invoice in Paint and save it. So IF I use a new box, I have it ready to use. But mostly I'm too lazy, and I just say that I didn't use a new box. I'm still working on a pack of boxes from 2021, and one of the editors told me that the invoice was too old and I couldn't possibly be using new boxes from that shipment in 2023. I don't argue with editors over 52 cents.