How to reassemble the missing piece that remains in X68000?

[Dhampird]

Hello, after removed the entire XVI computer (very fast) and when I reassembled, i discovered that i have a metal plate that i dont know where was located, i tried to search where this plate belong into X68K, but i dint find the way to reinstall it. Maybe if you are XVI CZ-634C-TN owner you´ll know about where fits this unknow plate. Probably this is not important but now i have to find the way in which this piece of the puzzle fits. Following picture below I think the plate  belong to any part into red circle, you could see the metal plate in right image. If anyone knows how replace the piece please comment. Thanks a lot.