Shouldn't be too difficult to find the back or a copy of it in a few weeks. I looked at a few similar a while back on amazon and eBay. Those were close to these but not identical. The part will be in Samsung's inventory now so some suppliers will carry them. Will bet they all will be shipped from China so don't be in a hurry.
BTW, ordered a flex glass screen protector. If anyone's interested I'll review once it arrives. Fairly inexpensive (compared to the $50 ones) and they make them for nearly all the popular devices.