I just posted this in another thread, but UPS has recently taken on a role in the returns process for a few retailers, including QVC. You'll notice that if you initiate a return online, you're almost always given the option to select USPS or UPS for your label so you can go to the courier/location nearest to you. When I recently returned an item via UPS, I chatted with the manager, and he mentioned that UPS now does regular pickups at USPS hubs to collect and ship returns, so it appears that QVC may be decreasing or eliminating its relationship with Newgistics as a returns agent.
Basically, it seems that USPS sites are still simply functioning as drop-off hubs for returns, so if you want your return/exchange to be processed more quickly, it is best to select UPS for your label and courier whenever possible since they actually ship the packages through their system (with full, transparent tracking as well). And in my experience, returns get to their destinations about twice as quickly when I choose UPS. Good luck to all!