Got An Arrest Warrant In The Mail From A State I've Never Been To For Driving, Which I Haven't Done But Once In Over 10 Years

Location: California

I was checking my mail over the weekend, and I got an envelope that I took to be junk mail. I opened it Monday morning, and it said "Arrest Warrant," and it was from Utah, a state where I had never been, and it was driving, which I haven't done more than once in over ten years on account of partial blindness and symptoms of Parkinson's disease. The first and last names were correct, but the middle initial was wrong. The last four digits of the Social Security number were totally wrong. The driver's license number was correct and the address, obviously.

I called my cousin, who lives in the municipality that the warrant originated from, for the first time in years, but she had no idea anything about it.

There was no phone number to call, so I googled it and called and spoke to an administrator who said that it was indeed a legitimate warrant. She suggested I send a copy of my old driver's license and my current California state ID and the story and they will get it taken off. About an hour and a half later, I got what they called a "Clearance Letter" with a signature of a clerk on it, but no printed name. The email says:

Thank you for reaching out to us regarding the active warrant. After reviewing the matter, we confirmed that your driver's license was mistakenly attached to the citation in error. The warrant has been recalled and properly reissued to the correct individual, and your information has been fully removed from the citation.

The title on the attached document says "Acknowledgment of Compliance" and "The Court herein named acknowledges that the defendant below has complied with the terms of the offense herein indicated." But I didn't commit an offense and didn't comply with anything except prove to them that's not me. At least I hope that's not what I did.

I was joking about it the first day, but since then, I've been panicky all week. How can they just "mistakenly" issue an arrest warrant for me? How do I know it's not active anymore? How can I be sure that I won't be arrested at any moment? Will this show up on a background check? Would it have? Do my friends and family, whom I joked about it with, suspect me of actually having an arrest warrant? Is this a civil rights violation? I was never under arrest and lost no money. Is there a case for damages? Should I report possible identity theft to the police? If so, which jurisdiction? I don't suspect my cousin of anything, and I barely know anyone else in that town. Will this mystery ever be solved? How do I even know what questions to ask or to whom?

Any point in a generally helpful direction would be greatly appreciated. Thank you.