Lost Loot machine contents not saved with game save?

I experienced a game freeze today during a boss fight and had to quit out using the guide button and restart the game. My character continued on from the last New-U checkpoint, but when I got back to Sanctuary my lost loot was empty even though I know for sure there were about 4 blue items that I did not pick up since my backpack was full (more vending machines please!)

It seems the lost loot status is not saved with a regular checkpoint save? Not sure what else may have caused this glitch.