I'm investigating the issue and I noticed that I placed the holden/glover household twice in the world and I did not change their name. Do you have something similar in your world, two households with the same name? Also what world are you playing in? Edit:Also, did you have multiple saves and are they still ok? Edit…
what other eps are installed? What number is in the bottom of the launcher? Did you try deleting the whole electronic arts sims 3 documents folder? (Take your save game out before you do that)
The Retro Model T works for me. Perhaps there is something in the way of the Sim? There needs to be enough room for the animation of 'Sit'. The sectional sofa just needs to be placed next to each other and they should automatically connect.
Most items will fall back to the BG version. But if there is no equivalent of it in BG, it will fall back to nothing. But it should not ruin the save game you have.
So I tried this on another account and the games weren't showing up either. They did pop back when I registered another game. But I will do some more research into this.
You could try clearing the documents folder (drag your save game to the desktop first) then go to your account on the store and look at your purchase history. From there you can re-download the items.