If they don't appear in hammer you didnt instal them correctly. Mind that there are two different models folder. There is:
in the former go the model files and the latter you have to put in the prop's texture files.
Now you should see them in hammer and can try packing the map. If you pack automaticly, make sure the scan path is correct and leads to the /tf folder. Press scan, auto, apply and then save. Check if the file paths are correct. in VIDE they should only name the folders after the tf folder, for example "/materials/models/..."
If you add files manually make sure the path is the same as I just described.