In 2015 I bought an EVGA SuperNOVA 1000 P2 with a damaged box from Amazon Warehouse for $150 when a new one was around $200.
Most things on Amazon Warehouse are new with a damaged box. It will tell you in the description. In my case it was: "Item is in original packaging, but packaging has damage. Small (less than 1/4" x 1/4") cosmetic imperfection on front of item."
The front of the cardboard box had a hole in it, but because of the way EVGA (and most other companies) packages their stuff, there was just some foam where the hole was, not a big deal. The power supply itself was untouched.
I would avoid any description for a video card that says the damage is on the back of the box, since I think video cards are closer on the back so you can see the serial number sticker in the little cutout.