Pres. Lincoln and Alec Stephens Agreement at the Hampton Roads Peace Conference

[Steve]

The record is for the right person, I've attached images of the most relevant documents in the file. The wording of Lincoln's telegram speaks of "an arrangement I made yesterday with his uncle", so that seems like it's more of an exchange agreement than a favor. Unfortunately, the last thing chronologically in the file is Stephens going to President Lincoln and doesn't have any specifics about his exchange.

If what you posted is correct and Stephens was immediately exchanged and not paroled, then there would not have been a Union officer released. It would have been up to Alexander Stephens to arrange the exchange/release of the Union officer after he received the letter.