Something that irritates me about this movie. (Score 1)

I know this is a little off topic, but here something that really irritates me about this movie. The guy had enough time to put together these clues to help him figure out his past, but why didn't he just write himself a letter explaining everything? I have not seen the movie, so I am not sure if there was some explanation as to why he could not do that. Therefore here is a second part to my rant. If he couldn't just write himself a letter and found these articles and his memory was erased, then why would he suspect from these objects that his memory was erased? Wouldn't he have just seen the articles and went: "well, this is strange," and continued on with his life?