Recently, I asked my Bank of Ireland not to send me statements (because I didn't wan't my wife opening them
Charming!!
OP - I would do up a generic letter and post it to the head office of all the major banks. Include all variations of her name (maiden, married, nick name, middle name etc) and all the addresses she may have used. Say that you have reason to believe she had an account with them and they will search all their records.
Is there a possibility that she did the wisest thing & spent it all on having a good time??
You don't know his motivation for doing this. Maybe he was saving towards a surprise for the wife and the statement would have spoiled it?whiskey, I would say your wife really loves you !!!