Like Jake, I've gone over my covers like it was my job and there is absolutely no difference from an official one, with the exception of the logo. That will not be true of all that you will find online, ebay, etc. There are definitely non-oem versions out there. One of the best indicators is that part on the inside that is of a different material than the rest of the cover. Not sure why this part is different or what its for but all the oem covers are made this way. There are plenty of covers for sale that DO NOT have this and are possibly not built on the same lines. These are the ones to avoid. They probably have a cheaper version of the samsung logo as well. If you want to know what the official logo looks like, go to a Best Buy. Many of theirs are non-carrier phones.
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