What if specific property mentioned in the will has been sold or cannot be found?

If the will or trust identifies property that was sold prior to death, then that property shall be disregarded and treated as though it did not exist.  Exceptions do apply if the property was sold while the decedent was alive but was incapacitated.  Normally, estates that are probated will have a final document "Decree" that provides for the distribution of unknown but later discovered assets.