I want to get my iphone replaced at the apple store, because of a couple of issues. Do I need to bring everything that came in the box? And do you need a receipt? Because I don't recall ever getting one in the first place....
I'd bring it in the box it came in, just to be safe. A receipt would be a good idea also. The apple store probably emailed you a copy of the receipt, so check for that.
If you were in the UK you would usually go to the original retailer for a replacement, taking some proof of purchase (the original receipt is not obligatory) and I would take the box and all accessories just in case you got a new complete boxed iphone.