A record of a research conversation with Claude (Anthropic), reproduced word for word.
Here's what I actually found by searching the scanned originals directly, rather than modern commentary about them — and the answer is genuinely interesting.
I ran full-text searches against the Internet Archive's own OCR index of the scanned page images (not summaries of them) for the earliest printed sources about New Zealand and te reo Māori. That gets you as close to "an original document" as digitisation allows — you can click through and see the actual page.
Zero hits for "maori" in every pre-1838 source I could check this way:
One genuine trap worth flagging, since it's exactly the noise you've been fighting: a Project Gutenberg reprint of Earle's book has a chapter heading reading "Maori Non-Progressiveness." That heading isn't in the 1832 original — it's a later editor's addition (this text circulates from a 1966 annotated reissue). It would show up in a keyword search looking like 1832 evidence and isn't.
The earliest one I could actually confirm, page by page: J. S. Polack, New Zealand: being a narrative of travels and adventures during a residence in that country between the years 1831 and 1837 (London, 1838 — two years before the Treaty). "Maori" appears repeatedly through the book, always as a qualifying word meaning "ordinary/common/native," not yet as a standalone proper name for "the people" the way it's used now:
You can see these on the actual page scans yourself here, with the matches highlighted: archive.org/details/newzealandbeingn00pola
This fits the linguistic record: Herbert Williams's dictionary records "maori" as originally an ordinary adjective meaning "normal, usual, native" — as opposed to introduced/foreign, or to atua (supernatural). "Tangata maori" meant "an ordinary man," not "a Māori person" in the modern collective sense. It only hardened into today's capitalised ethnonym gradually, and the record suggests that hadn't fully happened even by 1840.
Two honest caveats: I could only search what's been digitised and OCR'd — Richard Cruise's 1823 journal, for instance, is on Archive.org but has no searchable text layer, so I couldn't check it this way. And an earlier instance may sit in an unpublished missionary letter or journal (Marsden, Kendall, Henry/William Williams) in the Hocken Library, Auckland Museum, or the CMS archive at Birmingham, none of which are full-text searchable online. If you want, I can go further into any of those specific leads.
Sources: