doubleofive said:

I've got one of those in my collection at my mom's. I believe it has the bounty hunter that makes Han (try to) leave the Alliance in ESB.

He's one of the bounty hunters that Han encounters on Ord Mantell. =P In official canon the honor falls upon Skorr who was actually the very first bounty hunter offered up as explanation for Han's line is ESB. That was in The Bounty Hunter of Ord Mantell.

This record was the second explanation and was actually written by Brian Daley the writer behind the radio dramas. When asked why he covered something that had already been explained he revealed he had no idea it had already been done and admitted he wouldn't have had he known. You can actually listen to the entire record here.

That all said, I have my own personal theory about who the bounty hunter was. I like to think it was a close encounter with Boba Fett that ended in the disintegration of a rebel operative. Perhaps the operative sacrificed himself by taking a shot meant for Luke. But since the canon has taken an official stance I'm glad it was Skorr who won out.