Twenty-one days is the maximum incubation period for the Ebola virus. As of yesterday, my family has been out of the Ebola zone for that long. Nope, no one developed symptoms.
It should be safe for them to tell people that they were in Liberia. Hopefully others won’t freak out too much. Actually, it seems that Coloradans have been pretty relaxed about it, especially compared to some of the reactions other embassy evacuees got on the East Coast.