Thanks Dog good point.. and ... Alan..
Ok maybe good news, next day today, the display of the 4 is looking a bit darker, so maybe if it was not used in while the black crystals need 1/2 days to get in action and get dark? But was worried on that... maybe the display on this model, or lets say rated Fair condition, not just because exterior, which is actually fine, but display is not strong, which they the seller did not show photo of.