It wasn't obvious that...

I just bought 141 Ornate chests. I got 225 commons, 45 uncommons, 12 rares, nothing higher than rare, no treasure. 3 chests had uncommon/rare, none had rare/rare or even uncommon/uncommon.

 

I had one rare/rare and a couple epics. While the server is down I'm going to crunch the numbers on this and the campaign/MP chests I've logged.

 

I just cashed in all but one of each of my items, then dumped the gold into the level 9-16 chests. Out of 84 chests, I got 125 Common, 32 Uncommon, 8 Rare, 3 Epic, and 0 Legendary.

Now the server is down for the launch and so all is past.