So my sister broke up with her boyfriend. treating her like shit,

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So my sister broke up with her boyfriend.
treating her like shit, ignoring her texts and calls, etc.
thing is, we have some of his shit and vice versa.
we have stuff like clothing, passport and his court papers.
he has stuff like a comforter, couple sweatshirts and a his phone that my mother would like back as she still holds ownership of the phone.

we sent him one last mature message to set up a time on Sunday in which we could meet up and exchange shit.
hes not responding though. come Sunday my mother is gonna cut all ties once and for all.
removing him from the cellphone home group, blocking and deleting every contact associated in any form to him.

I guess in the end I cant stand the thought of a twig of weightless shit conning my sister like that and has the balls to get another bitch 3 days later.
Can Ontarian Police do anything if he refuses to give back anything?
and on to a more illegal approach, How much can I make selling his passport and SIN? (more like a don't poke the tiger when you're in its mouth)