Legally, yeah. Politically, I can see something developing and the Treasury being ordered to return the coins. Also, just because the Supreme Court didn't take up the case now, it doesn't mean they can't take it up at a later date based on different circumstances.
I don't see the coins ever being handed over to the Langbords. There is also little chance the government might put one or more coins up for auction. There are enough museums with numismatic collections (ANA, ANS, several current and former mints, several Federal Reserve banks, Harvard, Princeton, Yale, etc.) to which the coins can be loaned that all ten coins can be kept busy. Plus the Treasury Dept. has realized that exhibiting the coins is a great PR draw. The size and beauty of the coins, the sale of the Farouk coin, and the publicity of the Langbord case has made the coins a crowd-pleasing attraction. Cal
As I'm sure many of you know, there is an excellent book on this subject: Double Eagle: The Epic Story of the World's Most Valuable Coin. It is truly a page-turner.
For anyone pin-headed enough to believe that “possession is nine-tenths of the law,” this case should demonstrate otherwise.
The problem was the "guy" with the other tenth was the one that makes the law. His tenth outweighs your nine tenths.
Alison Frankel and David Tripp wrote books on the 1933 double eagle in 2006 and 2004. I wonder if either is updating their book based on the Switt-Langbord court case. I believe that if the US Supreme Court had decided in favor of the Switt-Langbord family, the family would not have gotten the coins but a new court trial. (Is this so, lawyers?)