I THINK YOU ARE ALL (MEMBERS AND AUTHENTICATORS) TOO TOTALLY AWESOME FOR WORDS (I AM FROM CALI...WE STILL USE "TOTALLY AWESOME"...CUT ME SOME SLACK
)!!! THIS FORUM IS THE BEST THING I'VE EVER FOUND...WISH I HAD FOUND IT SOONER!!!

Yes, the red patent tote (you posted about elsewhere) is authentic. The lining is correct for that bag.
A serial number's validity has nothing to do with registration.
I believe that the bag you are asking about is a MFF bag and many won't be in Coach's system.
If the person questioning the bag wants to come and ask questions, you're welcome to send her a link to this thread and she can ask about any listing that concerns her.
Believe it or not, the person questioning this bag is (supposedly) a Coach employee and claimed that siggy lining is very rarely used. Pfft.