Are you sure to feel sorry for the seller?
A clever seller of fakes will act exaclty like that: when found out, they would immediately refund (they would lose a claim anyway, so why bother with headache) and pretend they were SOO distraught... And, of course, it is a gift...And, of course, a Harrods receipt... for something else. Very familiar. Then they receive their positive feedback (and their fake bag back! important, since fake alexas are not cheap either, and a paypal claim will mean that the bag won't have to be sent back to the seller, but destroyed) and off they go
to find their next victim, until they get someone who does not notice the "fakeness".
Simple.
I think, this seller would be out there with her black alexa... beware...
Sorry, grumpy Korzinka does not have much optimism re. this story...