My Car Registration Was Stolen. Should I Be Worried? What Information Can He Take From Them?

Regarding a stolen car registration -

Yes, you should be worried because -
The most common reasons for car registration theft include:

Obtaining the Vehicle Identification Number (VIN). Gaining access to your VIN may help thieves register illegal vehicles. They could also file claims on totaled cars or even create duplicate car keys. There have even been instances where individuals use a stolen car registration to walk into a dealership and drive off with a brand-new vehicle. They're preparing for a break-in. Your car registration contains vital information, including your home address. Depending on what the thieves find in your car, they may target additional valuables kept at your residence. Although this specific scenario is less likely to occur, be sure to take extra security precautions in the days, weeks, and months following a vehicle theft or burglary