The FCC closed the seemingly endless Auction 73 late this afternoon after no bids were submitted in Round 261. The Auction raised $19.592 billion in 28 days, but the winners of the 700 MHz licenses still remain a mystery. The FCC said it expects to reveal the secret identities of the high bidders in the next 10 days. There’s still no word on the fate of the D-block shared public safety/commercial license, which failed to reach its minimum reserve price. (See story to follow.)