The first season TNG Blu-Ray features a few seconds of the Klingon cruiser raw elements that were re-used from TMP as well. But some elements remaining is hardly indicate of them all remaining.
I'm curious how you know it's a raw element.
Perhaps I'm speaking beyond my technical knowledge (essentially, none), but the documentary includes footage of the model against a blue screen. Perhaps Trek Core has a screen capture of this?
EDIT: Not blue screen, against black. Here's the image
(Is it perhaps not stock at all, but a new shot?)