I went ahead and emailed the seller about it and they replied with this:
"Hi Justin,
We purchase all of our Radiant Historia copies direct from Atlus. That is how all of them were sealed and shipped to us. We literally have about 600 left in that same packaging. I can assure you the game is in there as we have sold several hundred pieces with no complaints.
Also I have taken a picture and attached it to show all the games we received have the same packaging.
If you are still unsure, we can always do a return for a refund of the purchase price, but we cannot refund the shipping as we cannot get it back.
Thanks,
PlayCanada"
I guess I'll just open it anyway to be safe. So much for a sealed copy