Hi Magne,
The staff at Waikumete have only had the Hillsborough and Waikaraka cemetery records since November,prior to that they were held at the office at Waikaraka where the ladies knew Hillsborough so well.
I noticed the grave next to Thor had multiple burials in it.
The book at Waikumete is the burial register with all the plots marked as small rectangles with the occupants name written in them,there is also a cemetery register which usually has more detail like name, age, last place of residence,place of death,funeral director,next of kin,length of time in NZ etc,this register and also a register with the name of the person who purchased the plot is held in Auckland City,I hope to get in to the city next week and search both these registers for you.
Cheers Janette