Thieves have netted thousands of dollars in a scam targeting rural people who use their mailboxes to send cheques.
Thames Police yesterday used Facebook to warn people in rural areas not to send cheques using the gate mail pickup system, where their outgoing mail can be picked up by rural posties, and to consider internet banking.
Sergeant Jared Thompson said an "organised group", possibly gang-related, was targeting rural letterboxes with their flags up looking for letters addressed to organisations like the Inland Revenue Department.
"This particular group are going around and will stop at mailboxes with the flags up. They will quickly go through all the mail to find the one that obviously contains cheques and then they'll steal it."
Mr Thompson said the cheques were then washed using chemicals that remove the pen ink but leave all the other details on the cheque before writing a new amount and payee.