@Despop919 Yes, that's what I was wondering. So the saves are in the Saves folder inside the Sims 3 folder? The individual saves can't be floating just within the Sims 3 folder, or the game won't see them.
If the saves are in fact in the Saves folder, please check the last modified date on the deviceconfig.log in the same Sims 3 folder. It should match the last time you launched the game. If it doesn't, that means that there's a second user data folder somewhere that the game is reading instead of the one where you've put your saves. You can open a File Explorer window and search for "deviceconfig" without quotes; any Sims 3 user data folder will have exactly one of these, and you'll be able to go to the original location to see where the other folder is located.