Verified resale tickets are tickets purchased through the athletic department and being resold.
The seller (original owner) has listed the tickets and the “middle person” such as Ticketmaster verifies that the tickets are good. If you buy tickets from an ad such as on Craigslist, you take the risk of them being fake
I’ve sold through the exchange and like it. Everything is handled for me. I don’t have to print a label and take to UPS.