The idea that when something (such as data, memory or a particular object) inconveniently and inexplicably goes missing it is thought to have deleted itself out of impulse or intention, i.e. it has self-expunged.
I was certain I put my car keys here, but it looks like they've self-expunged!
used by the scp foundation in articles or reports. DATA EXPUNGED means the data was deleted from all records while Redacted means you need a higher clearance level to view the information.
The data recovered from the artifact shows that DATA EXPUNGED. research halted on order of the overseer council.