Law enforcement help? Which law is broken?

I was in the school library and left my phone there around 9:42. Before 10:30 I realized i dint have my phone and I left it in the library. The iPhone was taken by another person. They are in possession of an item that is not there's.

The supposed story of what happened… I left my phone in library. A student found it and told the teacher. They figured out it belonged to me. The teacher told the same student who found it to return it to me. He was bringing it to me when another student stole it from him. I, he, the teacher, and police officer know who this thief is. I have been trying to get the phone back as it is valuable and expensive another one.

Added (1). I don't know how the other student took the phone that's what I'm currently trying to figure out

The phone is stolen, the crime is theft.

You left it, thus it became misplaced.
The teacher should have handled the matter and held on to the phone.
The student who stole the phone from the other student? How did this happen?
The Police will investigate the matter and hopefully find the phone for you.

I'm not sure exactly what you are asking. But if you just want to know what law was broken then it is theft or larceny depending on the value of the phone.

It sort of sounds like these kids are trying to pull a fast one on you. But going by what you said, the end result is that the kid who has the phone now stole your phone, it doesn't matter if you had it or some other guy had it at the time. He still stole your phone.

Kind of coincidental that your phone never gets stolen from you, only during the small period of time that this other guy was "returning" your phone to you does it get stolen from him?

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