Just to update my experience...
I spoke with the workshop in the Madison Avenue store when I was in NYC over the weekend. They were incredulous that an SA had treated me the way that she did. They told me that they wished I had brought my bag, that is not Hermes policy, and of course, they can tell if the bag is authentic after examination.
I also communicated via email with Hermes corporate, and this was the response.
We apologize for any difficulty you have experienced with our Madison boutique, and have forwarded your comments to a supervisor. We recommend that you bring the item into the nearest Hermes boutique, and a sales associate will be happy to assist, and determine how to repair the item. Please be advised, the boutiques do not accept any repairs by mail.
To find the boutique nearest you, visit our store locator at http://stores.hermes.com/.
We sincerely appreciate your feedback and hope you will give us an opportunity in the future to exceed your expectations.
Again, thank you for your interest in Hermès. We look forward to your next visit with us.
It seems that some SAs are just making up policy, and I am not sure what the correct answer is here. Perhaps you have to insist on speaking to a manager? I agree that this makes the secondary market shaky, and I do think that it casts a bit of a shadow on the value of the bags long-term. No one wants to purchase an authentic bag on the secondary market and be embarrassed in store when it is rejected due for authenticity concerns.
My bag was just passed down - I got three pieces a Bearn wallet, a Picotin MM and this Birkin. I know that my great aunt always bought Hermes for love of the brand, quality of the item, and investment value (somewhat)... I don't think she thought she would ever sell them (I don't know if she ever did), but I think she thought she could pass them down. Anyway, I guess I will chat with the Atlanta boutique today to see if they will accept my bag. If not, I am just going to donate to charity and be done with Hermes.
After chatting with the shop at Madison Avenue, I walked across the street to Goyard where my daughter and I were treated beautifully by the sales associates there. Refreshing.