Is it possible he's expecting something he doesn't want you to see and being so drunk thought that was it? I bet something did eventually come in the mail. Something he bought with payments he doesn't want you to know about. Who knows. A letter from another woman. God it could be anything. I'm only speculating from my situation and what my idiot would do. That's when my stxa gets rid of stuff. When he's done something that I set a very clear boundary for. But they are too drunk to cover their tracks properly.