He has also noticed an increase in the number of young people misbehaving.
Leckie works for Spotless Services, which provides cleaning, security, carpark and food-court attendants at the mall.
As site supervisor and head of security, he oversees about 30 staff.
He has reunited lost children with their parents, directed tourists to the albatross colony and helped evacuate the entire building when someone set fire to a toilet-roll holder.
A few years ago, a man proposed to his girlfriend in the food court and a New Zealand Idol autograph session created mayhem when the entire ground floor was a "mass of people".
Working in a shopping centre, especially one in a high-profile area, means there is plenty of variety in his duties and the people he meets, he says.
One of the main problems for the security guards is the growing number of youths who are rude to others or who engage in disruptive behaviour, such as throwing things from the balconies into the food court below.
Another issue is shoplifting. The centre bans shoplifters for two years, and issues 20 to 30 such notices each year.
"Sometimes we get the comment thrown back at us that it's a public building," he says.
"Yeah, the public use it. But it's privately-owned and we have the right to trespass whoever we like."
Hawkers, buskers and protestors are also banned.
Thirty CCTV cameras and two security guards on foot cover the mall, the carpark, the loading dock and the building's perimeter.
In the past two years there has been an added hazard in the form of seagulls that nest on top of the building and "dive-bomb" guards when they walk across the carpark.
May Day protests against consumerism and globalisation were also "a bit disruptive" in the past but not so much in recent years, he says.
"They tried to hand out pamphlets inside the centre and would lie in front of the main doors to try to stop people's access.
"Obviously, being in Dunedin, we also get students coming in," he adds. "They spend up quite large during Orientation Week and add entertainment during the year.
"One Nude Day, half a dozen guys decided to do a lap around the upper level outside Kmart . . .
They had absolutely nothing on except hats and socks."
Leckie caught up with the group as he took the escalator from the mall's upper level down to Kmart. The men were on the adjacent escalator, going up to the carpark.
"They were on their way to their car so there was not much point in talking to them," he says.
"But the [carpark] booth operator must have got a surprise when they pulled up and handed over their dollar fifty."
