Man Buys Police Car At Auction, Then He Finds This In The Door

Is this standard?

While Officer Henry looked up the license plate of the mysterious vehicle, Matthew asked the question that actually bothered him the most. He told the officer again about the rattling sound in the door frame and asked if police cars had something built in there that could have come loose. It was a logical thing to ask, and I hoped for a simple answer. But the truth behind this rattle was shocking for both parties.