The t-track on every prop that comes from the Gary Kurtz collection has that funny shape that doesn't match ANY known screen used pieces.
I find that really suspicious.
There is a story that they ran out of black T-track and had to paint some brown stuff. Maybe the brown was a different shape, but it sure is fishy.
All the real props from ANH to ROTJ in the Lucasfilm archives have the same t-track which matches movie stills and period reference photos.