*** Rotorua Cemetery database is indeed INCOMPLETE. There are members of the departed community who are not in it. ***
taonga1, I have the burial register entry for Herr Lechner, if you'd like to PM me your email. The sexton (private contractor) did not know exactly where he was buried but will look into it further on Monday for us. He offered to take a photo with his cellphone and send it - sorry that was the best I could do as I wasn't going to be there Monday. Herr Lechner was one of the people exhumed from the former cemetery at the top of Sala St, Rotorua and moved to the current site (further along the road). As a result it appears that the entry in the register does not directly match the references in the current cemetery.
Leandra, have sent you a PM with a photo of your folks.
Sidenote: the gentleman that I went to visit, does not even have a headstone or anything but green grass, so his grave couldn't speak to me and tell me his story.