A few years back, cgs offered the option of no photo (for 2 or 3 pounds less) if the value of the coin was less than £200. However, they have removed that option and photograph every coin now. I agree with Dave. There is no point in sending it back to cgs as it is impossible to prove who is at fault. If the photo shows the edge knock, then cgs will say it was like that when you submitted it and it has already been taken into account when the grade of 82 was given. If photo shows no edge knock, then it is just as likely that NGC has caused the damage when taking the coin out of the holder. NGC would of course say it was done by cgs.