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Just searched on scratching and found this post.I have the same issue andI've done nothing to encourage this scratching and you can see it when the trunk lid is closed. Very disturbing!
I can fit a finger inbetween my trunk lid and bumper and cant push it down. What year are all of your cars? Maybe your rubber seal has flattened out and is no longer supporting the trunk lid
RE: Anyone else ? scratches on rear bumper from trunk lid
Hope you can see it in this pic.There are two, each areapprox 3-4"wide sectionsof scratch marks on the rear bumper. Each are a few inches away from the center point of the bumper.