A total of BTC144,000 was seized from Ross Ulbricht by the FBI.
In the first auction, some 30,000 coins were sold. 50,000 more were sold during the second auction. After the third auction, some 14,000 coins will remain with the FBI.
Just found that , the first 30,000 coins auctioned belonged to the silk road server (the escrow hot wallet). They also seized 144,000 that belonged to Ross, so after the next auction of 50,000 there will indeed still be 44,000 to be auctioned off.
14,000 + 30,000 + 44,000 BTC