there was a car that had a factory rubber mat there, I can't remember forsure which it was but it was a soft rubber but not flat. it had a few ridges in it for some compression. worked well
is it possible it's the obs? honestly these things should have the fob that stays in your pocket with a push button. it's amazing how annoyed I am at carrying keys around when at first I was like push button is dumb. now this yukon is the only car I still have keys for and I absolutely hate it. gm started push button in 05. how does 2011 still have have it in what's considered a fully loaded truck.
lady that owns a shop we deal with from time to time for inspections loves her tahoes, had every Gen up till 2020 I think it was. she finally gave up. said the one she got still having to deal with keys was to much after. driving her daughters Ford. for a while and when a deal came along she bailed.