Read about this in the RJ:

The Venetian offers a new promotion, running through April 29, called "Treasures of Venice". Every night casino workers draw 3 names of gamblers out of a drum, and then each gambler gets to participate in a mini-slot tournament where the winner gets a chance to open 14 treasure chests. No details given on exactly how the gamblers's names get a chance to be drawn, so check the slot club desk for details.

Each winner starts with 10 keys, and if the player opens the 14th treasure chest, the player wins $1 million.

No surprise here...so far there's been no big winner of the $1 million. And that's my final answer!