Are you obsessive and angry over things that were stolen from you?

I know we’re not supposed to put a lot of value on stuff. And we’re to let go of anger. But I am almost obsessed with the theft of some of my lovely things and I think my grandson stole them. He is a teenager and quite troubled. My sterling silver charm bracelet that was my mother’s is gone. My mother’s amazing chrysocolla rock with quartz is gone and I’ve spent two weeks scouring Ebay for one half as nice to no avail. My pendant I was given at age twelve for my first Communion is gone. Is anyone else guilty of this resentment and sorrow and how can I get past it? Please don’t tell me to confront him; he’d deny it. He lives hundreds of miles away. I shudder at the thought of him ever visiting us again.