In legal trouble for buying stolen items

We made the mistake of buying a camera from OLX from someone without a bill, it turned out to be stolen.

Now they have tracked the camera to us, and police is saying since it was found with us, the law considers us the thief.

We have no proof of purchase. So it makes sense.

Is there anyone more knowledgeable in law than me who can give tips? Is the police right or just scaring us to get more bribe money out of us? What can we do? Should we talk with a lawyer?

We have handed over the camera already but talks are still ongoing as for what’s gonna happen to us.