Federal prosecutors have raised doubts about the authenticity of a letter purportedly sent by FTX founder Sam Bankman-Fried from prison. The letter, which was sent via FedEx from the Palo Alto or Menlo Park area, contradicts his current incarceration at Terminal Island federal prison. Prosecutors highlighted discrepancies, including the letter's incorrect labeling of his prison as a state facility and the use of a typed signature, which violates federal prison mail regulations. While prosecutors stopped short of accusing Bankman-Fried or his associates of forgery, they argued that these inconsistencies cast doubt on the letter's origin and credibility. Bankman-Fried, serving a 25-year sentence for fraud and conspiracy, is seeking a retrial, though appellate judges have shown skepticism toward his claims.