Attorney General William P. Barr and Geoffrey S. Berman, the United States attorney in Manhattan, each have indicated that the authorities are continuing to investigate potential co-conspirators in Mr. Epstein’s alleged sex-trafficking scheme.

A spokesman for Mr. Berman and a lawyer who had represented Mr. Epstein each had no comment on Sunday. Kevin R. Kamrowski, a deputy United States marshal in Manhattan, said the agency was aware of the documents, which were published online. But, he added, “Some of the documents released were part of an active investigation and at this time we’re not making any additional comments.”

According to the documents, Mr. Berman’s office referred Mr. Epstein to the marshals service as a convicted sex offender who “may have not reported all his international travel as required.”

Mr. Epstein was required to register for life as a sex offender as part of a widely criticized deal he reached in 2008 with the United States attorney's office in Miami, through which he avoided federal prosecution there on sex-trafficking charges. (He was allowed to plead guilty to state charges of procuring a minor for prostitution and soliciting prostitution. He served 13 months in jail, but was allowed to leave six days a week on work-release.)

The documents show that in mid-March of this year, Mr. Epstein filed a notification of travel with a sex-offender registry office in the Virgin Islands. A few days later, the marshals service received a notification from the registry that he was traveling to France via his private jet.

According to a public website that tracks flight activity, Mr. Epstein traveled that month to Austria and Monaco — but neither country had been listed in his notification form.

The documents show that later, in July, investigators asked federal prosecutors to submit legal requests for information from France, Monaco, Austria and Morocco.