Newegg Open Box items don't always work. I was sent a totally DEAD Seasonic power supply by Newegg as an Open Box purchase once. This was a few years ago.
I returned it, then tried buying ANOTHER identical power supply. Newegg sent me the SAME EXACT unit a second time. It was still dead.
An Open Box Antec power supply wouldn't start up its fan. If you spun the fan manually, it'd keep going, but on reboot, the fan wouldn't start. I ended up wiring the fan directly to the 12V bus so it'd run at a constant speed and that worked.
Dont' get me wrong. USUALLY Newegg Open Box items are usable. I used Open Box motherboards for years, usually without issues. But one had a voltage issue that interfered with the onboard sound chip. The board seemed reliable otherwise, but I ended up putting it back in the box and setting it on the shelf rather than waste more time diagnosing the problem. Another Open Box motherboard had a misbehaving video slot and I sent it back.