You posted in the iPod Shuffle forum; it might be best to post in the iPad forum, as I was a bit confused at first. Anyway,
It doesn't need a SIM to download apps if you have Wi-Fi. Can you describe this box a little more, or better yet, screenshot it?
Taking a Screenshot:
Quickly press then release the home and power buttons at the same time.
Get the photo on your computer and upload it here.
If you don't want to do this, can you describe it a little more? When you say "black box," I'm guessing it's an outlined box that appears around any item that you tap on. Is this correct? If so, it sounds like VoiceOver was enabled. See:
(Note that I am a representative of the organization for the above link, which is not endorsed by Apple)