so i just flew from LA to London, my iphone was tucked away safely in it's incase case, in a small pocket in my notebook bag. now i take a closer look at it and see this little white line/scratch on the top left of the glass. it looks like a scratch but i can't feel anything when i run my finger over it. plus where it was stored, there was nothing sharp or metal, to cause such damage. any ideas? could this be caused from underneath the glass somehow? it's not a big deal, and not something i'd take it back for, but just wanted to get some opinions from yall.