Habro never done the Vader ESB..it was the New Hope with misprinted box.
Its been discovered that The hero saber for ROTJ is actually also the hero ESB....the MPP's did not go missing. That was rumor. The lightsaber that got labeled as the ROTJ saber is the sunt saber from all 3 films.
So in essence Master Replicas did a ROTJ Vader Force FX. There was one MPP that made it through all 3 films.
I don't even... every single thing in this post is wrong.
While it may be true that Hasbro never released an ANH, MR certainly did. If you want to get technical, no, Hasbro never released an ANH Vader, but MR - which many people equate with Hasbro - definitely did.
Also, no MPP flash appears in ROTJ (that we're aware of, anyway). The hero ESB was certainly not the hero ROTJ; but the hero ROTJ
was the stunt saber from the other three films, as I think you tried to point out.
We're fairly sure that no MPP was used in ROTJ. ;)