The records also included another person of interest, Douglas Haig, whose name the judge ordered redacted. The Las Vegas Review-Journal used an unredacted copy and identified Mr. Haig.

Mr. Haig’s whereabouts was unknown and he could not be reached for comment.

A Douglas Haig in Mesa, Ariz., who is an engineer at Honeywell Aerospace, also operated a company called Specialized Military Ammunition, a limited liability corporation his wife opened in 2012. In October, Mr. Haig told Newsweek that he had been interviewed by agents with the Bureau of Alcohol, Tobacco, Firearms and Explosives. He said that he did know Mr. Paddock and had not sold ammunition “for a long time.” On Tuesday, a website for the company noted “We Will Be Closed Indefinitely. Check back to see if/when we are up and running again.”