[mothered]

They didn't ask for signature or picture, just asked my name. But I've read ebay sides with the seller if the tracking shows it arrived, so I'm not sure if I should go with that method.

If eBay bases their decision purely on tracking confirmation, then disregard the DNA.

If I go with Item not as described, is it okay to show pictures I found on Google of the same monitor with dead pixels? I've removed the metadata and cropped it.

As said, you'll be Instructed on what to provide.