I didn't put this in GGD because, well, I need help searching for official documentation.

I purchased a used Xenogears yesterday from Hollywood Video, and when I brought it home, I saw that there were labels on the discs. Obviously, I know that labels on a game disc can ruin your PS2, but the manager would not let me return the game because he thought I was lying. In order for me to return the game, I need to find the information stating that labels will ruin consoles online somewhere, but my searches come up empty. Could someone help me out?