Generally speaking, for temporary visas, copies of partnership evidence are okay - although some originals would be good. For a temporay work visa as a patner, you only need otprovide a mzimum of one year's relationship - so you probably have some originals of recent documents. Useful documents are offical letters - utility bills, IRD letters, invoices etc. Try to spread what you send across the last 12 months, with something every month or so - then you might get a two year visa rather than one year. A few photos and letters from freinds etc can be useful too. Good luck!