Should i be concerned about this car tittle?

2 days ago o found a 2003 ford focus 106k miles for 1500 on a post in craiglist dc. I meet this guy in a open yard storage place where they keep other cars. When i handed him the money he gave me a tittle from virginia state and the owner appeared to be a dealership. The tittle was already signed with the same dealership name. When i went to the motor vehicle administration they told me they wouldn't process the tittle because it didn't have an actual name on it. I called him back and he told me to go back to where we meet. He asked me for the tittle and signed it under some ramdon name rosa gonzales a spanish common name. He is black and it has nothing to do but just so you know thats know even his name. After he signed it we went to a tag and tittle place and they process the tittle and gave me temporary tags for 30 days. Now the vin number is registered under my name I'm scare because i'm in probation and the last thing i want to do is get in trouble i took a picture of the old tittle that has the dealership name on that dealership is one hour away from me i called that dealership and they told me that they had sent the vehicle to an auto auction place. I called the auction place and they told me that they onlysell vehicles to dealers. My concern is why did he use a different name.
What is the best thing to do in this case? He didn't give me any letter saying he sold me the vehicle. Is it that he doesn't have a dealer liscence and thats why everything is so fishy?

I ALREADY CALL THE COPS AND THEY TOLD ME THEY CAN'T DO ANYTHING BECAUSE THE CAR IS NOT STOLEN OR AT LEAST IT HASN't BEEN REPORTED STOLEN.

You aren't going to jail over it. Calm down.

Don't worry about it. If the DMV accepted the title and processed a new title in your name, you have nothing to be concerned about. If the car was stolen, they would have known about it.