Perhaps I can clear some of this up...and allow all of you to further this debate.
The two idols in the archives ARE original. One has glass eyes, one doesn't. They are hollow fiberglass castings. The one with the glass eyes has a detachable back, with the seam running along the hairline and the back ridge. It has the bar inside as shown in the pics already posted, as well as the magnetic "latching" mechanism.
When I first started at the archives in 1988, the glass eye version (GE) was in similar condition to the one pictured in the Prop Store images. It was broken as well...as a matter of fact, had someone shown me those photos out of context, I would say they were taken in the late 80s of the GE Idol in the archives.
In 1993, Hata International launched an exhibit in Japan of many of the items in the archives. It wasn't limited to Star Wars; it included Indiana Jones, Willow, Tucker...and even Howard the Duck. As part of that exhibit, they paid for an extensive restoration effort for about 200 items. By that point in time, many things were quite neglected. The two idols were restored then.
For the restoration, both were stripped of the remaining gold plating (it looked like vacuum-metalizing to me); the broken bits were glued back together, and everything sanded smooth to make it look good...perhaps too good. It did look much too clean and not like the original once it came back from the VM, in my opinion.
The Lucasfilm Archive book that has been published was actually the exhibit catalog, written originally in Japanese. Since the two idols, C-3P0 and the Ark were out being VM'd at the time, we couldn't photograph them for the catalog. Hence, there is no photo of 3P0 in the book; a photo of the second damaged, non-restored Ark; and a photo of a casting of the Idol spray painted gold. This Idol was actually a present to Mr. Hata for organizing the exhibit.
Since I can confirm two versions of the idol exist, I think it still leaves the door open to debate as to whether or not the Hawaiian scenes has eyes or not. It was always my opinion that it didn't, and I don't think those screen grabs are conclusive evidence that there are glass eyes in there. The eyes are ill fitting in the one in the archives; there's tiny gaps between the eyes and the lids. I don't see that same fit in the Hawaii scene, nor is there much evidence of the seam line to get those eyes in there. There does appear to be a pupil, but that could've been painted on. Given my experience with 3P0 and the reflective issues the gold VM creates, it could be some odd reflection, but it wouldn't be consistent. My opinion is that they're gold eyes with painted pupils...but that's my opinion.
Let the debate continue...
--Don Bies