Kaleb had answered the door, she said.
Dellow said she was greatly relieved to know that her son had been found.
Earlier, she shared a message for her son if he happened to read this story.
"We're worried sick, we love you son, and I don't want to spend my Mother's Day wondering where you are. I just want to make sure that you're okay and make sure that you're somewhere safe.
"Just get in touch, with anyone."
Kaleb was also asthmatic which was playing up the night before he went missing.
"That also concerns me because it's cold and wet and rainy outside."
She hasn't had any reported sightings or feedback from his school or friends that she had reached out to since his disappearance.
"All the kids that I've reached to say they haven't seen him or don't know anything. I've asked the school to circulate something to see if any friends would come forward.
"He doesn't have to come home right now, but I just want to know that he's safe and being looked after and has food and clothes. It's any mother's biggest fear, you know."
She described Kaleb as being of skinny build, 1.7m tall, with short brown hair and green/brown eyes.
"He was wearing a black Kathmandu dress-jacket and his school uniform with Nike shoes when he left yesterday, and wearing a Puma school bag."
The boys Massey School uniform is a white shirt with grey pants.
