Do you write down the EXACT time you log out?
That wouldn't show up as anything unusual. It would just show up as you…logging in, from your computer.
In order to trace the "digital footprint" they would need access to your machine. That's where the log is.
Blizzard has a log of everything you do with your account.
Excuse me for a second while I refer to my log of last logout and last login. Now I ask Blizzard to do the same. Wait, what? There is NO unusual activity between the last logout before sleep and the last logon after work? So in other words my logon credentials have not been compromised.
That leaves us with two scenarios.
Exploit on Blizzard side. Massive loophole that eventually will be traced and patched.
Corrupt Data. DB lost primary keys/indexes are shot/pathways are incorrect...etc etc etc....meaning some nerd/geek smarter than I will point it out, it will be fixed and things will move forward and the poor geek/nerd will never get credit while some middle management bureaucrat will take all the glory and get a raise.
If I want to cover my tracks I'm just going to wait for you to log out, then log in, loot your character in 90 seconds then log out.