We have just come back from spending some time living overseas.
During that time our mail was redirected to my in-laws. We had told them that they shouldn't get anything important as we do banking etc online and to just bin any obvious junk mail.
We picked it up yesterday and they've been opening it all. We don't have any bank statements etc going there but we do get these end of year summaries which they've been able to see as well as some other things I wouldn't really want other people to see.
My husband told them off a bit for it bit they don't think they've done anything wrong.