What would you do if you caught your boyfriend's mom stealing from him?

I was in my boyfriend mom's car and was asked to look for a pen in the car. Where in the side door i found 3 of my boyfriend's products costing about 200-300 dollars in total. That i know for a fact that they're stolen, and they are his products. What would you do in this situation?
What would you do if you caught your boyfriend's mom stealing from him?
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