They could put their money where my wallet is if they like.
The runners could have moved, but a good 90 percent in places above the dust panel has gone.
Here are some better photos.
This one shows the wear on the runner right down to the dust panel and the wear on the drawer stop as it rubs on the bottom of the drawer, preventing this will mean preventing any further damage to the drawer bottom.
Its difficult to see the wear as the batteries on my camera have had it and it is taking pants photos.
The runner has worn so thin in places it is like paper.
You can see here how the side of the drawer has polished (with the help of some wax I suspect) the side of the runner as it wore down through it, you can see the level the drawer should be at above the polished part.
Just looked again , in the photo it doesnt look polished at all, best get some batteries in that camera.