I've regularly had letters that look as if they've been 'tampered with' but to receive a letter MINUS ITS ENVELOPE is the last straw.
Thankfully there wasn't enough information in it for me to be defrauded of my identity, but I reckon someone's already got that far with other letters.
What do I do? I live in one of those communal flats where the mail gets dumped on a table on the bottom floor. It's impossible for the postman to deliver individually.