Returning the old one
First, the packaging:
They don't have different versions for Wi-Fi only/3G models. In the past I had to peel the cover back to take out the SIM card. They've fixed this in the new version by making a cutout for the 3G version, then including a small piece you can stick back if you have the Wi-Fi version. It's bigger than the SIM card slot but I stuck it on anyway.