So you cash transaction from a guy in an Escalde in a parking lot and you wonder why cops roll on you?
Really ? They asked you the same questions over and over to rattle you and see if your story would change.

If they would have smacked you around, towed your car and kept you in jail for a few hours, you might have something to complain about.

But right now, you sound like a ninney. And it sounds like you bought a stolen i-thingy.