Question re. envelope/documents ** SPOILERS **

Rating: Null/10 (27 March 2006)

Can anyone offer an explanation for why Clive Owen's character didn't simply leave the envelope/documents connecting Case to the Nazis in the safe deposit box with the ring? He clearly wanted Case's background to become public -- and therefore left the ring and the note, "Follow the ring." But wouldn't the envelope/documents have accomplished that more easily?
And for those who think it's because he needed the documents to blackmail Case, I don't buy that. What would he blackmail Case for? Money? Not only did he already have millions of dollars worth of diamonds, but if he was so interested in money, wouldn't he have taken at least some of the cash so readily available in the bank?
What am I missing?