Australia Australia - Siriyakorn 'Bung' Siriboon, 13, Boronia, Vic, 2 June 2011

[Hercule Holmes]

Are you sure Cherie went to the same school? I've never come across that info before

Yes. The following is from a Channel 9 article from 30/7/2017:

Police keep in contact with Ms Schulz. When Boronia schoolgirl Bung Siriboon vanished, Cherie's case became a detail in the investigation.

The pair went to the same school, prompting police to investigate if there was any link between the two cases.

"We know what Bung's family went through. She vanished without a trace,” Ms Schulz said.

Seventeen years since Cherie vanished, Ms Schulz has moved away from Melbourne.