Frida Hussain KC, defending, asked if the boy looked “shocked and helpless”.
Garrad said: “That’s what I have written in my statement, yes.”
The Counter Terror Policing North East detective said he carried out a swift initial search to see if anyone else was in the property and saw the boy had a full-sized skeleton in his bedroom, as well as a Nazi-type cap.
The officer said Army bomb disposal experts and chemical, biological and radiation specialists were called in to assist with the search.
“We had to go through it very carefully and painstakingly to make sure everything was in order and safe,” he said.
It was a week before the keys were returned to the boy’s father, jurors heard.