Hi Virginia
As your people do not as yet have the connection to Scotland and the immigration or ships lists would be in New Zealand I would suggest posting to an New Zealand board and or list first.
If you go to
http://www.rootsweb.ancestry.com/Select mailing lists or message boards from the top bar menu you can search for relevant list/boards for your enquiry.
Although you may get help on the Angus board you are more likely to get help on a NZ one, then armed with the Scots origins of your people you could repost here or on a location board/list relevant to the enquiry
NJO