That is just so sad. The poor little frogs. I feel that they would have been bumped around to much within the containers they are in. I dont know the usual packaging in the US so another member will be able to set you straight. NZ is only 1985 km from top to bottom. How far were they travelling? I basically plant my frogs in the middle of sphagnum moss firmly so they cant move around. Sorry I cant be of more help.