Unfortunately this glass is scratched, not sure how this happened. It doesn't affect recordings and fotos at all, it is actually not even visible. Sadly my OCD is killing me and gives me sleepless nights.

It looks like its a 'scuff' mark - where the glass has rubbed against something in transit. You might be able to clean it using isopropyl alcohol and a cotton bud - if the 'scratches' are actually a deposit of whatever it was in contact with that caused the marks.