Well, feedback has been left and an apology has been made to me so it seems to be all good....
I had direct communication with CL head office in London from Monday, they agreed to take a look over my photos but asked whether they could see the shoes in the flesh. Fortunately buyer told me on Tuesday that she was taking them to Mount St to get a letter proving they were fake so I'd refund her. Without her knowledge I intervened and made sure that head office step in and take them from Mount St to a. re-check their authenticity and b. check that the shoes she presented them with matched the pics (to prevent substitution for any kind of scam).
Head office forwarded the email they sent to the buyer on Friday both confirming their authenticity and apologising for the confusion caused by the SA in Mount Street (who it turns out did indeed send the earlier emails based on viewing my listing, and who it also turns out is not an SA at all but rather the store manager....)
Interestingly Carol Diva thought they were fake; so whilst she may be brilliant with LV, I wouldn't advise her services for CLs I'm afraid.
Anyway, because buyer know nothing of my head office intervention, I didn't send her a message - figured I'd wait it out and see what she said. A day later I get the email saying that they were authentic, that she was sorry for doubting, and that she'd be leaving +ve feedback. No apology for threatening to send the feds round mind you.......
So - it seems she was genuine after all. The reason for the two week wait - I still don't know. I do know that she had them sent to her from Melb to London so that would explain the 2 weeks - but she got the email from Mount St on the 26th and must have chosen to sit on it while they were in transit.
I was cautious throughout all of this, didn't make her aware of anything I was doing to prevent potential scams and I remained friendly and professional throughout, even when she was hurling abuse (not easy, one of my messages was angrily drafted three times before I got DH to edit it in a more reasonable manner
)