iPad iPad air 2 exchange lottery

[Vagonator]

hi guys! I would ask for advice, I changed 4 ipad air 2 due to various problems (dead pixels, dust under the screen ... ect) this is the fifth and seemed to have the perfect screen until I saw a scratch on the screen, it looks like is below the screen, almost invisible but still is there,what you say?keep it?or continue with the exhanges?sorry for my english...