I've bought a few certified refurbished products over the years from a nationwide electronics store that rhymes with best guy. Aside from a few cosmetic dings they always appeared new. This unit showed up just plain filthy. The grime you see in the fan was also all over the inside of the case. This is a certified refurbished product? I did try blowing off the filthy fan and case with a can of compressed air that blew a ton of dust out but it did nothing to any if the grime. So I reached out to the vendor. They offered me a $10 refund if I wanted to clean the unit, see  if it works and keep it. ( see if it works? Really!) They also said it was a production issue, and that they would let the "production team" know about this and ask them to do better in the future. I know I know, but they said it with a great deal of sincerity lol. My concern is If they missed something that blatantly obvious what else did they miss or just not bother with? Needless to say this dirty, grimy "certified refurbished" unit is going back and I won't be buying from these folks again.