Martin Bailey of the Art Newspaper has an excellent story on the apparent export-bungling by Christie's and UK authorities of this £3m Rubens masterpiece. The Hunt of Meleager and Atalanta was granted a temporary export permit for 5 days to allow it to be displayed in New York. The work sold in London on December 2005 for £3,144,000 to an anonymous New York buyer. It was then re-exported after the sale.
In a statement to the Art Newspaper Christie's said:
Our policy is to adhere strictly to all applicable laws and standard processes for the international transport of works of art. In the exceptional case of The Hunt of Meleager and Atalanta, a human error led to the accidental shipping of the picture to a client without completion of the appropriate export licensing process. Christie’s regrets the error and are co-operating fully on this matter with all relevant authorities to rectify this situation.
It's uncertain whether the funds can be raised (as there are other works which need to be matched) or even if the New York buyer would consider selling the work. If she does not, the work will have certainly lost value, and I'd anticipate Christie's would be subject to a civil suit brought by the buyer. Though the work cannot be recovered because the US does not enforce the UK export restrictions, it will not be able to be sold or even travel to Europe in all likelihood. Both Christie's and HMS Customs have come out looking