The ones from New Orleans must have been removed from the drop box. Most that I had where by Michael Providenti and Brian O'Doherty. 

You can probably ask them for them again. I've put the 2012 pictures back up. And here's a flickr album of many of the photos form New Orleans, 

We should come up with a better system. Drop box is fine for when we're trying to get all of them together, but they should be downloaded onto something non-cloud after that.