From my experience of buy eBay certified refurbished items has been nothing but a disappointment, I have purchased two items from this category both are not what they say there are.
I brought a hoover that arrived covered in scratches & never really worked correctly from day one, contacted the seller they said "everything inside has been refurbished we don't do the outside"? I also brought a PSU for a pc a brand name Corsair.
Installed this into my PC to find out that this is also faulty, unfortunately the PSU blew up a GPU in the process.
Short post but don't learn the hard way with electrical items that are eBay certified refurbished, spend a few pounds extra & buy new.
One seller wanted me to return the item the PSU, but the cost of returning it waiting for them to test it & say "it's fine must be something on your PC" is not worth the time or effort.
I got the PSU checked by a local computer shop & they told me there is several problems with it, wrong voltage on several cables, this is what caused the GPU to burnout.
After 22yrs with eBay I will never buy another refurbished item again that's for sure.