It's so amusing how people look for issues. I guess we could combine checklist of
"What to do after you get new MacBook":
1. Check items placement in the box - if it looks suspicious, return
2. Check for microscratches on notebook with magnifying lens - if succes, return
3. Check battery cycles, if more than 1, return
4. Open checkboard image for 2 hours and check for image retention, return
5. Check if display is LG or Samsung. If any of those - return
What?! Everybody normal does all this stuff after buying laptop, I swear it!
also remember to make a new thread on macrumors forums about all of those things to ensure everyone knows how serious it is