Mooks, physical examination is the best test for authenticity, but there are things that look off to me one this bag. I hope your SA can help authenticate it.
Please shoot a picture of a rivet behind the stud on the handle and move the tassel around to see if the o-ring is soldiered shut or slightly open. Also a good close-up of the clip and bale would be helpful.
The leather looks a bit stiff to me. Brass hardware came out in F/W '04 when the metal tag was already in use for a while. So, if this bag has brass hardware and a leather tag, unfortunately it's most likely fake.