With my photos at Changi Airport on the iPhone showing the location as being Dunman Secondary School, I did a Google search and found this school was close by to Changi.

Following the school kids did lead us to the baggage claim area and there were our bags

Bags in hand, we wheeled away to the exit and were surprised that Singapore seemed happy for us to roll on out without any more checks (compared to New Zealand). We found the taxi rank