This is the reply I received when I emailed a question to "Wire Wheel" back in April (before the price reduction.)
"Thanks for your note with interest in the Birkin CS3. This car is currently being shipped to me but is held up in Miami, FL by US Customs. We are buying back from a customer in St. Maartin. I hope to know more within a couple of weeks, if not sooner."
The comment "Sold for Export Only" would imply that there are some customs issues.