That sucks
I don't understand how they are depositing your checks and getting away with it? I've done banking with my bank for years and they still look at me funny when I deposit or withdraw from my own account.
Can't they get surveillance or records of who is depositing them and track them back to the thief? Sounds so weird and confusing. Call the Chief of Police and make a report against the cop if he isn't doing his job. It goes on their record and they have a hard time getting promoted after that.