Then as they were written and forged AFTER you left they certainly had no role in your termination. I don't know what the company hoped to achieve by doing it, but as you have evidently not suffered any financial loss from it you have nothing for which to sue anyone. There are lots of things in this world that people do that are morally wrong but for which the law provides no remedy in court. It would appear this is one of them.
I get the impression you'd like to use anything you can to stick it to this employer, but don't let non consequential things start you off on wild rabbit chases. Focus your efforts on the legal matters you already have going.

