There were a few sentry safes that I heard about that were sold as being endorsed level safes but were not actually 6mm steel .They had taken into account the two layers of steel that sandwiched the fireproof liner when getting them checked out but the two layers still didnt add up to 6mm .
Sentrys own website has a questions section on that safe where it lists it as 13 gauge steel 2.78mm.. However a lot of safes that are brought in are custom made to comply with NZ laws so the website listing may have no relevance to your actual safe ,
Best bet would be try get hold of the nz importers outdoor brands and see if your safe is actually up to correct specs and get a new engineers report which they should still have on file hopefully .
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