No I don't have it backwards. It may be the case that they have such contracts. However FedEx also has a low-rate ground service where they pickup a company's packages and those packages are subsequently delivered to the USPS for long haul ground transport and eventual DELIVERY. This was explained to me BY FEDEX when the first of many lost or overdue packages I've had in the last year was three weeks overdue. I have already instructed suppliers that I do business with to NEVER use that service/rate.
Never heard of it. If it has a FedEx tracking number, it has the FedEx guarantee. It’s not the Post Office.