I realize 200 kB is hardly anything, but I worry that if some data can slip by, that perhaps a larger amount might slip by as well at some point.
I didn't use my phone at all between getting it at the Apple Store and setting it up to my home wifi. All yesterday my only usage was at home on my wifi. The only thing I can think of was the phones were in sleep mode on the drive home, but I hadn't activated my email account or downloaded any apps at that point.