After the crash today I lost some valuable items in my stash, the cube and it’s contents.
Is there anything I can do to get those back?
Nope, it’s not possible to restore them now. Unless Acti-Blizz does something about how the servers store the states of the characters on their side.
I wonder how funny it will be when this happens when ladder launches. Imagine getting a sick item and rushing ahead of others, and then puff, sorry you’re out of luck and we can’t do anything about that 
Not like we are the ones who developed the game or anything 
Same here, today i looted a nice Titan’s Revenge and almost perfect Gheed Charm but now they are gone 
I get shako 30 min before crash and now is lost…
Sorry to hear about your losses. I lost all of my gear and this is what blizzard told me. Sounds like it applies to all items/characters… so frustrating.