Sorry, I don't mean tell them about the bin vs keeping it secret!! rofl
What I'm saying is does it really matter if they know or not? If they get suspicious that it's because you don't trust them then what I meant was: say you're keeping the deleted posts as a record, to refer to if anything went 'tits up'. Ok legal reasons was a silly phrase to use.
Err, aren't they going to behave more honestly if they know you can review which posts they deleted?

Have to say, if I worked at McDonalds and was going to nick a burger - I'd do it when no-one's watching.