If I unknowingly bought stolen property, can the original owner file a civil lawsuit against me?

Question Details: I unknowingly bought stolen photography equipment from an artist and sold some of it on craigslist. After some days, a PI came to my house and told me that the equipment was stolen from a rental company. I went to the cops and they confiscated some of the equipment. I was left with just one equipment out of the rest. Now, the PI is asking me to return all of the equipment back to the original owner or face a civil lawsuit. How can I protect myself from losing more money/equipment? I have not received any notice from the court or the cops asking me to return anything. Can they even file a suit?

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