what more information would you require? Catching them in the act? Even then you would be probably asking for explanation, asking if OM possibly slipped on wet floor and stuck himself into your W.
Stop with the snooping, you are only making things worse for yourself. Scramble all passwords used to snoop on your wife and stop with it. Snooping only interferes with your growth, delaying your journey. Face the music that your marriage is over. Done. Finished. Kaputt. Dead. Muerto. No more. Gone. Dust in the wind. It was over at BD. And no amount of snooping will unscrew your wife. And no, it is not OM's fault. It takes 2 to tango. Is it your fault your marriage failed? Yes. To some percentage, you are also at fault your marriage ended. DEal with it. Forgive your self. Take valuable lessons from it. You need to grow, you need to further yourself.
Stop snooping. Further snooping WILL DO YOU NO GOOD. It will only screw with your mind, and heaven knows, your mind is screwed enough ATM.