I agree with other poster, this is done almost everyday. You are the maker of these items and have all the right in the world to deposit them into your account with the notation "Not used for purposes intended".
Just thought I would update everyone who has been following this post. My lawyer and the lawyer from the bank played telephone tag for 2 weeks and so I had my lawyer send their lawyer a fax. Their lawyer called my lawyer who was in court at that time so their lawyer left a message he had called and for my lawyer to call him back. Two more weeks of telephone tag so it is time to file suit! The bank knows I can not go to another bank to cash them because my name is not on the payee line. After 8 weeks I still have the checks and no money.