Baird watched recorded CCTV footage to try to get to the bottom of the missing trays.
He identified a period of time when the trays could have been taken, and a person who he thought was Ngawhika entering the office where the trays had been stored.
The CCTV footage showed the person using light from a mobile phone to move around the storage space.
Ngawhika claimed the sacking was unjustified because there was no "clear evidence" that he took the silver trays.
Arthur found that on the balance of probabilities, Baird had undertaken a sufficient inquiry into the evidence on the CCTV and answers to the questions he put to Ngawhika about the missing trays,
Neither the ERA nor Baird had to indisputably prove that Ngawhika had taken the trays, Arthur said. The process Baird had carried out reached a conclusion that it was more probable that Ngawhika had taken the trays, and therefore his dismissal was justified.
Read the ERA decision here: