The only way to help the victim rid themselves of the spirits, they claim, is to go home and retrieve money and jewellery and bring it back so it can be prayed over. 

When the victim returns they are told to close their eyes while the group prays over the bag, and exchanges the money and jewels for another heavy item. 

The victim is told not to look in the bag until they get home and when they finally do, they find their valuables have been stolen.

Detective Senior Constable Adam Stafford said one of the three victims of the "cruel scam", which originated in Hong Kong and China, lost valuables worth more than $150,000 - their life savings. 

Two others lost as much as $50,000 combined - and there could be more victims who are yet to come forward. 

"It's quite embarrassing for the victims, a lot of these instances are probably being under reported for that reason," Det Stafford told reporters in Box Hill on Tuesday. 

"This is not physical offending - it's psychological offending and the damage they are doing to them is not a good thing."

Det Stafford said the victims were aged in their late 70s and 80s and police believe the scammers may be part of a travelling syndicate, with similar incidents reported in NSW. 

"If your elderly mother or grandmother is attending the Box Hill area, and is of Asian descent, make sure they are aware of this scam as they will most likely be approached," Det Stafford said. 

Police are already increasing patrols in the area and have sent out warnings in Asian languages as some of the victim's do not speak English. 

Almost 40 per cent of Box Hill's population have Asian ancestry and more than 27 per cent of residents speak Mandarin, according to 2021 Census data.

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