So I recently purchased a $.99 keyboard cover from Amazon: http://www.amazon.com/TopCase®-Transparent-TPU-Keyboard-TOPCASE®/dp/B008454IWY/ref=sr_1_2?ie=UTF8&qid=1346635096&sr=8-2&keywords=retina+keyboard+cover I have noticed that the cover had sort of a raised tab on the letters "f" and "j", maybe as a guide for touch typists. I was gone for the past two days and hid the rMBP in between clothes inside a drawer. When I got back today, I saw two dusty marks on my screen which was caused byt the two mentioned tabs on the keyboard cover. The mark came off easily but I am worried about any further damage it can cause in the future. Any of you guys have noticed this on your rMBP and keyboard covers?