It's not only the MIC tag. You can see it is fake just looking at how it is made, but I wanted to confirm in case it was the angle of the camera or something. I don't want to accuse somebody of selling a fake bag, unless I am 100% sure of it.
If you had an authentic Rocco I think that you could easily spot the differences. We cannot discuss the details, because it would help counterfeiters. If you are curious you can read the posts at the beginning of this thread (and maybe the last few pages) to see how an authentic Rocco should look like.
Receipts can be easily faked, and they aren't proof. I am not sure that I understand where the seller claims she bought it from, though.