They also found a bloodstained knife.
Akshay Anand Chand, who turns 19 tomorrow, was also at the property and was later arrested and charged with killing Christie.
The Herald understands Chand and Christie knew each other from school.
The pair never had a relationship.
Christie finished at ACG Parnell College last year and was in her first year of study at AUT University. Chand is unemployed, according to court documents.
Burton-Burn took to his Facebook page yesterday to share his feelings.
"All I can do is be glad that I ever met her and look back at the amazing month we had together before she had to go,'' he wrote. "I spent today with Christie's family. We went to visit the house, it was so hard ... we picked some clothes for her to wear [and] sorted out the funeral as well."