ActewAGL has collected 91 per cent of bills which were sent out by mistake to 400 customers last week in a massive privacy breach that affected 6000 Icon Water and ActewAGL customers.
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That means a week after the first bundle of bills was identified, the private billing information of about 540 utility customers is still in the hands of strangers.
ActewAGL confirmed last week that 400 electricity, gas and water customers had received bundles of bills addressed to 6000 other customers.
The bills arrived loose leaf in envelopes and boxes, in some cases containing more than 500 bills.
The company said on Wednesday that it had identified all of the customers whose invoices were sent out by mistake and had written to all of them.
ActewAGL general manager of retail Ayesha Razzaq wrote to affected customers on Monday to apologise for the "oversight".
By Friday last week, 70 bundles of bills had been retrieved by the utility provider.
The company said it would write to recipients it had not been able to contact by phone and supply a reply paid envelope to return the bills.
"We will provide a formal report to the Office of the Australian Information Commission within 30 days of the incident, in accordance with our obligation under the mandatory data reporting scheme," a spokeswoman for the company said.
The Canberra Times revealed nine cases last Thursday where bundles of bills were sent to the incorrect ActewAGL and Icon Water customers.
John Steep, who received about 200 bills in an envelope addressed to his Belconnen home last Wednesday, waited until Friday morning to have the bills collected.
Mr Steep was told last Thursday that the bills would not be collected that day due to safety concerns for ActewAGL staff driving on wet roads.
The bills will be reissued with a new payment due date, the company said.
ActewAGL manages mail-out services for Icon Water through a third-party mailhouse, where the error occurred.
