You would have to prove, that you firstly stole the package(then you open a pandoras box of previous crimes), then prove that the person put it in the package(V

You would have to prove, that you firstly stole the package(then you open a pandoras box of previous crimes), then prove that the person put it in the package(Very hard to prove, like whats the evidence). At the end you would just end up going to the police confess the crime, open the door to be prosecuted for other crimes. And yet end up proving nothing about the other person from whom you stole. It would be shooting in the foot at epic proportions.