Vancouver police have recovered 1,400 stolen credit cards and thousands of pieces of mail in a multimillion-dollar fraud operation.

Police said Tuesday they found the goods earlier this month in an opulent home in the Vancouver suburb of Coquitlam.

Canada Post master keys were recovered in a Coquitlam home.
(CBC)

They also found Canada Post master keys in the house.

Police say members of a sophisticated crime ring based out of the Lower Mainland used the keys to steal credit cards, driver's licence documents and Canada Revenue Agency information from mailboxes.

Vancouver Police Det. Grant Campbell says those involved copied the credit cards, re-sealed the envelopes, put them back in the mail and then waited for the owners of the cards to activate their accounts.

Police are looking for four people who will face numerous charges, including fraud and possession of stolen credit cards. They didn't arrest the grandparents and children found at the home.

With files from the Canadian Press