From a question in answers:

We recently ran into a problem in which an employee left our company and we lost some documentation for a team. Our confluence instance is tied to AD, so his account was deactivated. I ended up going through the AD team to reactivate his account, reset his password, then log in as him in order to see his drafts (which in turned allowed us to save some other content he had started but not saved). Is there no way for a Confluence administrator to view and delete drafts for a specific user? That feature would be incredibly helpful.