I'm absolutely furious about those damn holders. All four of mine have broken now. One in the back seat broke the first time I got back there. It takes little to no force to actually break the things. My car has less than a thousand miles on it, and four broken holders. If I don't get this fixed by the body shop at the dealership, heads are going to roll!
I found my floor mat retainers in the trunk, as the TSB for the initial work to be done at the dealership said that they would be. They were never installed. (I was wondering why there were holes in the carpet and floormats.) Since they never adjusted the tire pressures correctly, or installed the holders for the floormats, I assume that the service department at the dealership never read the introductory TSB for the car. How cool is that? I put the factory floormats away and put in my rubber "Taz" floormats. I live where it rains all winter, (Oregon,) and I don't like to make a mess of carpeted floormats. They do move around a little, but I have to clean them up every so often, so I think they work fine.