Need advice on the legality of an unsigned exit agreement

Need advice on the legality of an unsigned exit agreement

I was recently downsized, and my attorney and my former employer's attorneys both made revisions to the original digital exit agreement letter. I signed and submitted the final, complied version and have since received my lump sum and unemployment payments have commenced, meaning my former employer has followed through with their primary actions as outlined in the letter. I have not yet received a copy signed by my former employer despite repeatedly asking for it via email, my only means of contacting them.

Considering that there are aspects of the agreement that govern both my and my former employer's conduct and actions into the indefinite future, is this document considered legally binding for one or both parties if only one party signed it or the fully signed version wasn't shared with the second party? And if needed later on, can I prove in court my attempts to get a signed version by showing my unanswered requests for it? I'd ask my attorney, but wanted to ask here first to avoid additional fees.