Supplement 12/2013: I buy the paper again and am happy with it unchanged. In the meantime more than 10 packs ever was a case which has been damaged by moisture or pressure.
Supplement 08/2014: And again bought a few times, always arrived undamaged in optimized protective packaging. All sheet in the usual quality, no color differences observed.
Supplement 10/2014: By now comes the paper, which is anyway already housed in a sturdy card packing, again in a second larger cardboard box with me on. They would have already jumping around it, so that the damaged.