I am in the process of getting a divorce and I have to say that my well-developed snooping senses have served me well (along with YEARS of experience in knowing what to expect from EXAH).
I have copies of everything financial I can find, I have voice mails recorded, I have pictures of things (many of which are already missing) out of our garage.
I say if you are doing it to protect yourself (financially or othewise), then go for it. But if you are only doing it in an attempt to 'prove' something to him, it's less than useless, and will drive you nutz.
(((HUGS)))