what cc do you have installed? you might have accidentally placed something. if you want to check... i would remove all your cc temporarily, try to load your build, and see if anything is missing. it should say "x items have been removed" when you load the build.
Additionally, you can try using Sims4TrayImporter. 'Open' the household in that program, and it will give you a list of any CC that household (or Lot) may be using. Cheers.
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