Just saw this post. I usually get my bags from this store also ( 2 Lindys, a Birkin and a Bolide).
Usually I call and ask what's available.
Is this the salesperson you usually use?
I have usually use Eric -has been very helpful, but have never gotten a call when a Birkin is available. The last one I got, was the luck of the draw- happened to be available when I called.