False Hope
After running all of these tests, the FBI concluded that the letter they received was not actually from John Anglin. The DNA tests didn’t match to go along with the handwriting samples.
The FBI concluded that there was no way that John Anglin could have written the letter they received. The authorities figured that the letter was more of a joke to get the attention of the cops, and create a rather large story for the media. And now that this matter had been resolved, the case of the three prisoners still remained unsolved.