Bremerton police are sorting through an estimated 500 pieces of mail discovered Sunday in a wooded area off Lake Flora Road.
They estimate that there are as many as 100 or more potential victims in the case.
Most of the mail came from addresses in Mason and Pierce counties, but some was also from Kitsap County.
Sergeant Kevin Crane said that a property owner was notified about the large piles of mail by some brush pickers.
Crane also said he has never seen a stolen mail case of this magnitude.
“We have stolen mail occasionally here and there, but have never had it to this extent,” Crane said.
Investigators continue to sort through all of the mail and identify victims.
They estimate there may be nearly 100 victims who may not even realize they have had mail stolen.
In amongst the stacks of mail are checks, gift cards, medical information, financial information, bills, photographs, packages and holiday cards.
Investigators will be processing the recovered items in hopes of identifying persons responsible.
They will also be working with the US Postal Inspectors and attempt to notify the numerous victims in this case.
Bremerton Police caution people to watch their mail carefully and to use the post office for outgoing mail rather than placing outgoing mail in rural mail boxes.