This chapter does not apply to poultry meat which bears the official mark of a city, county, or state poultry plant inspection service for sanitation outside of the state which has requirements equal to those which are provided for by this chapter if such out-of-state requirements have been approved by the director. If, however, any packing, repacking, or cutting up or recutting is done, except in a retail store or public eating house, in this state it shall be done in a poultry plant which is licensed pursuant to this chapter.