How did you successfully copy and paste the results of search? I've tried and failed twice. Honestly, NDHA has about 25 2008 briefing documents stored and catalogued in New Zealand Libraries Catalogue. I don't know where the 2011 documents are. Govt departments increasing efficiency under National appears to involve relentless reduction of publication programmes and a disregard for making conventionally published items reliably available.

I've never tried to copy and paste the URL for a search result. A keyword search with fewer terms - I should have truncated minister - is closer to my original result:
http://nzlc.natlib.govt.nz/vwebv/searchResults?searchId=274&recPointer=0&searchType=1&sortBy=PUB_DATE_DESC.
Still not much for 2011, though.

Is this service likely to be any more reliable than the individual Government departments? A number of the 2008 briefing documents are in the National Digital Heritage Archive, accessible through the New Zealand Libraries' Catalogue - although the bibliographic records note that the links won't work. There is only one 2011 briefing paper so far, and I would have thought there would have been a harvest since then.