An email popped into the inbox of a famous radio host this month, sent by a young man from the Bahamas, with an offer he hoped would turn the head of even an industry veteran: scripts for the first six episodes of a coming season of a hit television drama, the last of which was currently being filmed.

Prices were discussed. A video chat was arranged with an interested buyer. The man, Alonzo Knowles, 23, sent a few pages from the drama script and the script for an unreleased comedy film, but he promised a cache of even rarer entertainment industry loot, according to a federal criminal complaint.

Among the items he offered to sell were scripts for three comedy films, a hip-hop biopic and another television show; Social Security numbers for actors and professional athletes; and, according to the complaint, sex tapes of celebrities, including one Mr. Knowles later passed along that had been emailed from a television host and columnist to another radio host.

“This is just a sample of things I can get,” Mr. Knowles wrote when he sent a sex tape to the potential buyer, who was in fact an undercover investigator. “I have more stuff along these lines and can get more if you’re interested.”