Not sure if this is question for learning czech or just status, but allow me to mention that in this kind of sentences (sth from/by sth, sth from/by sb), "od" is used as "from/by" person, company's name... "z" is used when referring to countries, cities, institutions, nonliving things... so correct form should be: Kde jsou balíky z ČR? Kde jsou balíky od Chunghwa Telekomu? More info and examples about prepositions can be found at http://www.locallingo.com/czech/grammar/prepositions.html