Hi everyone, it's been 4months using my Filco ninja. I didn't notice there's a damaged on the side of the keyboard case until I clean them due to the dust. At first, I thought it's a dust, but when I smudge it with my finger, it feels the plastic is is like somehow damaged. I'm not planning to buy a custom case in the future. Here a picture of it :

Lastly, I just want to know anyone who own this, is it a common issue or the edge of the keyboard case is smooth.
http://i.imgur.com/TYApi8L.jpg link for the actual size.