This^^^
An expanding battery did not make it buckle at the - volume button. This is classic iPhone 5 bending
After reading posts in this thread like "aluminum does not bend", I understand why people remain confused. So much erroneous information
so what is the conclusion? the TS have his device replaced and i hope mine is the same i will bring the device to send in for warranty, it is just bulging at left side near the volume down button
and i found this
http://www.tested.com/tech/ios/454866-apples-iphone-5-warranty-guidelines-uncovered/
"The one type of external damage that is covered is a bulging case that's due to a swollen battery. In that situation, the entire phone can be replaced at no cost."