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I think the Mafia is trying to frame me because having two pieces of evidence for one murder seems like too much. And I wouldn't plant evidence myself; I'm not that stupid to do something like that and expect no one to figure it out. So, most likely, only one thing is real evidence, and they're trying to pass off the second fact as evidence. IMHO. I wouldn't be surprised if something else appears against me.
P.S. By the way, the theory about the two birds is good... they did the same thing to me last time.