Those are crazy VRM specs. As you said, way overkill even for a 7950X, and 9000 series is to have even lower power requirements. But I suppose they need something to justify the price, at least it has a 7 segment display!
Regarding NewEgg open box items, I've found them to be hit or miss. Sometimes you get a product that looks brand new and you wonder if the box was ever truly "opened" or just ordered and returned. Sometimes you get a board in a box with nothing else and you wonder if it was an RMA.
Ryzen R7 5700X | B550 Gaming X | 2x16GB G.Skill 3600 | Radeon RX 7900XT
Ryzen R7 5700G | B550 Gaming X | 2x8GB G.Skill 4000 | Radeon Vega 8 IGP
Ryzen R5 5600 | B550 Gaming Edge | 4x8GB G.Skill 3600 | Radeon RX 6800XT