Chip, or debris? Yuck. Sorry man.
Regardless of the possibility of others receiving a phone like that, you should return it right away.
a friend of mine received what looks like an air bubble under the bezel on the side. it doesn't affect the phone functionally, but she went in for a replacement and they swapped it out without issue. it isn't a big deal; these things happen.
If everything else works fine on the phone, and the screen is good. Keep it. If you use a case you probably won't see it.
Then just before the warranty runs out get it exchanged.
The biggest "problem" is that we dont have an Apple store here in Denmark and the operator which delivered the phone is "webbased" and get their phones from a parent company based in another country.
That said, I can't just go get another one...
I will, if lucky might have a new phone in a week plus
But...No harm...I have an 5S... but...bad start...
I can't believe people are saying keep it if everything else works fine? What the heck happened to getting what you paid for?
Honestly I think it's BS about only people who have problems are complaining and the majority of people have zero problems.
If that's true I must be the unluckiest person on earth because I've owned every single iphone to date and have had build quality issues with every launch device since the 5.
I never had to do any returns for the 1st, the 3G, 3GS, 4, or 4S...This whole de boggle began with with 5, 5S, and now onto the 6. For the last three years I've never gotten a spot on device on the 1st try and have had to go through multiple try's to get a device that is worthy of the price tag.
I think it's safe to say Apples quality control has gone straight into the toilet since Jobs past away.