I have a box I bought which says USPS on the sides. Think I can still send it UPS? I would think so right, as long as I have the UPS sticker on it and UPS comes and picks it up?
I just took a FedEx box to UPS and they took it w/o any problems. I don't see why a USPS box would be treated any differently. Just make sure there aren't any shipping labels or bar codes showing.
Re: NPR - USPS box through UPS?