OK, does anyone know THIS?

[Iggy]

I would go to the bank and explain what happened. Sounds like this person took you mail, how exactly did they get you checks? You can show them your ID and show them that you didn't sign the checks (you didn't right?) and they might be able to give you the money they credited to their customer. If you signed the checks already, then there might not be anything you can do. Do you know if the checks were drawn off of the bank that cashed the checks or did a customer use their own account? That could also make a difference in what they can do. They should have images of the checks and they can use the numbers to find out whose account it was processed on unless in was in a large deposit (they don't print on each check in that case). Good luck!