The DMs can hook you up with the items you've lost. Please point them to this thread and the screenshots herein.
The only way to prevent something like this from happening when withdrawing from auction or storage (SQL databases that save instantly and automatically) is to log off the character to save the character right after.

Otherwise if there is a crash there's a chance that your character's saved file will be several minutes-to-a-couple-of-hours old.