Kaane, I am glad you have such a high opinion of... my opinion...
Let me just state that this IS my OPINION and not necessarily fact.
For years it was said the ESB suit was stolen, but as has already been said, we now feel very confident in saying it was the INTENDED ESB suit which was stolen. We believe the PP2 was intended to be the hero ESB suit, but at some point, possibly during the time it was being passed around for promotional purposes, it was stolen. We know for a fact that the helmet and jet pack are now in private hands and have been told by the previous owner of the jet pack and helmet that the rest of the suit was pieces out. We can't verify that.
We know the ESB hero helmet still exists and from what I have seen I believe Kaane is right that the Armor was painted over for RotJ. We see hints of it in the exhibits. Gauntlets? Hard to say.
The RotJ undersuits were clearly ESB/Prepro blue at one time and any of the undersuits could in fact be the ESB undersuit.
We have heard rumors (and I have seen ONE pic from back around RotJ timeperiod) that a badly damamged ESB pack is in the archives but to this date, no one has shown any photo proof.
Fettofficer, I don't mean to sound ugly, but without any proof... I have heard stories like the 1000 times and it always comes up empty. Without proof, I wouldn't really be willing to give that rumor much consideration because the evidence is against it. Now, I would be willing to consider that some of the PP2 might be out there somewhere, but I find it incredibly unlikely that the ESB is out there. I think it is spread all over the place, in exhibits, at the archives, repainted, reworked.