Why will there be a warrant for my arrest and can I tell them I don't want anything to do with his sentencing?

My car was recently stolen but was recovered. I paid to get it out of a towing lot. Shortly after I received a letter saying I needed to appear in court for the case about my car because the man who had stolen it was taken into custody. I was sent a paper to fill out to attend the court but I ignored it thinking I didn't have to go to it because I didn't file a lawsuit. Later on, I received another letter stating another court date was set and if I didn't attend, there would be a warrant for my arrest? I did nothing wrong. I don't understand my car was stolen and I got it back and didn't think I had to be part of the man’s court date.