I just got served papers that were supposed to be for someone else

I was cooking this morning when the doorbell rang and when I answered it a guy handed me some papers.

He could tell I was confused and said that he just delivers them. He didn't ask me my name or anything and just walked away.

I had something in the oven and trying to keep my dog from running outside so when I finally stepped back inside an looked at them and figured out what they were, I was going to try to tell the guy but he had driven off.

Is that a thing? Just walk up to any house and give legal documents to whoever opens the door?

Am I liable for anything if I just toss them?

I don't want to get involved in anything or really care but I don't want anyone coming back to bother me about this issue.