The way I understand it is the non too bright bozos forgot to delete their communications before replying to the good American citizen.
I am inclined to think the "inadvertent" release was not so inadvertent and there are more revelations to come pending legal counseling. How many other people did DOH do this to and did they also inadvertently get a copy of communications concerning their requests? Think Climategate. Besides hard copies of emails and records on servers, any checks with Google will be discoverable and Google keeps everything. Attempts at destruction will be futile. DOH employees should remember the third rule of crime, first one to break gets less jail time.(first rule don't do it, second don't get caught)