Winifred_Willow You might get lucky and find the saves, or some of them, in OneDrive. If it's been running at all, whether you deliberately use it or not, it could have synced your files. Check onedrive.com, both My Files and the Recycle Bin, and rename any saves if they're not in the proper format.
When you moved the files back, did you confirm that they were in the correct folder and, if cut and pasted, that the Paste process had completed?
Separately, where is the game installed? You can see the location in the EA App, under Sims 4 > Manage > View properties. Some players have combined the game's program files and user data, which can delete the user data or prevent it from being placed back where it belongs.
You can also search your computer for your missing saves if you're interested. I'd suggest using Everything, from VoidTools, which is a free and highly-efficient search engine. Search for Slot_ and see if you can spot any of the missing saves, or any saves at all that aren't where they belong.
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