Baronlando said:

I thought the 1985 IP was one of the sources "stripped for parts" in 96 to make the special edition? I hope I'm wrong.

It might have been. I thought that the 1995 THX release was made from the 1985 IP though, or am I wrong about that? Somebody needs to do a guidebook about all these sources.

EDIT

I went and checked ILM: Into the Digital Realm, and it reports that the 1985 home video IP was the source of both the 1993 Laserdisk and the 1995 THX release. While it doesn't outright say it, it might imply that this might have been cannibalised, as it says that "the IP" was used in place of O-neg shots that were too damaged (and the 1985 IP is the only IP ever identified by the writer).