also the back pocket zipper doesn't contain any letter as you can see in this photo.
I am not an expert but sorry to tell you... one thing for sure it is fake is the serial number, the number U-CU-0114 use on the fake bags in many other styles!! I got a fake box bag in same number But do not worry, call paypal and file the claim it's a lot easier, trust me you will get your money back. Good Luck!!