Buying an iPhone 5S from an Apple Store

So I am going to buy an iPhone soon, and last time I bought one at a Verizon store & It was my first iPhone, my 4S. But when I bought it at Verizon, the employee opened the box and set up my iPhone and everything. I know this might be weird, but I want to un box my iPhone myself, especially an iPhone 5S.

So if I go to an Apple store and purchase an iPhone, can I just walk away and go home with the box unopened, or do they have to open it and register it with Verizon or somehting?

Thanks in advance!