I'm not trying to be difficult, but I urge you to consider whether you're possibly thinking about this backwards. If you don't notice a problem, is there really a concern? If you post pictures asking people explicitly to look for anything that isn't perfect, and someone (primed to look for those things) thinks it isn't perfect, is that really a good reason to consider a return?
The only argument I can see for worrying about it, if it isn't bothering you, is resale...but I think you have to ask yourself whether a buyer of a used laptop down the road will not only notice something that you aren't, but also care about it. The odds are good that a person purchasing a used laptop won't have quite the same exacting standards as a person popping the seal on a brand new box.
In short, I'd encourage you to enjoy your purchase. It looks great to me, and it seems to be working for you. Isn't that what counts? Just my 2 cents.